Frequent 3g connectivity on/off on vista side - Shift General

Hi.
Anyone with same problem. I only have seen it on vista side. Working with 3g conectivity. One minute is connected with tray icon showing globe. Then 30 isnt connected with tray icon showing computers with red cross. Then again connected 3 minutes. It seems a problem between vista side and internet sharing service from snapvue. I ve seen this issue in other spanish shift. Maybe a spanish version problem? any idea?
Thanks

Not much help I know but see my thread titled 'continued vista connection problems'. Have you been using internet sharing to gain access to WM 6.0? i noticed Activesync was always starting on the snapvue side which I think is linked to the constant disconnections.
A full restore from the restore partition solved my problem and I now get a steady 3g connection.

Thanks for your response. Not alone now. Format is a solution but we should know the origin of this problem. Obviosly is related with the way connects to 3g, this is, using Internet Shared connection with snapvue...but...why suddenly activesync (client or server part) tries to connect the other side and breaks the internet shared connection? any idea?Did you install sp1? is your shift language english or other one? ( I am trying to discard sources of the problem).
pd. While I write these lines on winmo side I can listen vista side sounds (connect/disconnect each minute...)

Hi,
I did some changes and It seems (by now) the problem is solved. I ve playing with continous 3g connections. This is what I did (I dont know which one did the trick).
1) Disable activesync usb connections for both sides( I did it for vista side days ago but know I did too in snapvue size.
2) Sevice Sync bluetooth Server stopped and set manually.
3) Reset both sides
Now I ve a stable 3g connection....

Daniel
Glad you got it working. What do you do to disable Activesync on the Snapvue side?
I only noticed this problem after installing SP1 but I was working mostly with WIFI so cannot be sure there is a link.

gavmiller said:
Daniel
Glad you got it working. What do you do to disable Activesync on the Snapvue side?
I only noticed this problem after installing SP1 but I was working mostly with WIFI so cannot be sure there is a link.
Click to expand...
Click to collapse
Hi.
The problem is solved, now for sure. Open Activesync in winmo,then menu/connections and uncheck "use usb ...". I removed too the partership between both sides althought It isnt important, I think...

Thanks Daniel. Good to know incase it happens again.

Today I am having the same issue...mmm, I dont know what else I can do. I will post the events I can see in the event's viewer....

danielherrero said:
Today I am having the same issue...mmm, I dont know what else I can do. I will post the events I can see in the event's viewer....
Click to expand...
Click to collapse
Hi Daniel - are you still having these problmes?

Hi. I didnt have that issue anymore. I removed the partership whith the device on vista side. I remove "Usb connection option" on activesync in both sides. I uninstalled "Remove NDIS Share connection" (Device Manager) on vista side and rebooted. Then on restart vista recognized again the device(Remove NDIS Shared connection) after some minutes(5-10 min) and then all worked correctly. I think the last step did the trick. But I am not free of problems. Like I told before when I resume the device and It was hibernated/suspended for a long time (several hours) the 20% of times It cant connect 3g and even I cant restart vista but keeping pressed the power button. So, by now, If my device is going to stay suspended for a long time (night) then I turn it off......
pd. When I need connect vista and snapvue I turn the phone off. I enable usb connection in both sides and use usbtools. After using the connection I undo these steps and all works correctly by now (last 3 weeks).
Ensure too that Vista hasnt setup a new Windows CE device on Device Manager. To check it open Device Manager, then "See devices by connection" and check each usb connection. If you see any Windows CE device disable it. I think both Remove NDIS Shared connection and a Windows CE Device was fighting for the same usb connection (In my case)

danielherrero said:
Hi. I didnt have that issue anymore. I removed the partership whith the device on vista side. I remove "Usb connection option" on activesync in both sides. I uninstalled "Remove NDIS Share connection" (Device Manager) on vista side and rebooted. Then on restart vista recognized again the device(Remove NDIS Shared connection) after some minutes(5-10 min) and then all worked correctly. I think the last step did the trick. But I am not free of problems. Like I told before when I resume the device and It was hibernated/suspended for a long time (several hours) the 20% of times It cant connect 3g and even I cant restart vista but keeping pressed the power button. So, by now, If my device is going to stay suspended for a long time (night) then I turn it off......
pd. When I need connect vista and snapvue I turn the phone off. I enable usb connection in both sides and use usbtools. After using the connection I undo these steps and all works correctly by now (last 3 weeks).
Ensure too that Vista hasnt setup a new Windows CE device on Device Manager. To check it open Device Manager, then "See devices by connection" and check each usb connection. If you see any Windows CE device disable it. I think both Remove NDIS Shared connection and a Windows CE Device was fighting for the same usb connection (In my case)
Click to expand...
Click to collapse
OK, the only bit I hadnt tried was the uninstall of the NDIS in device manager. I'll give it a go and see what happens. Thanks again for this reply!

Thanks Daniel for your detailed description on this problem, which I also have. Interesting thing is that for me it only occurs when I am on the move with my Shift. No problems when my Shift remains on my desk (like others described in this thread: http://forum.xda-developers.com/showthread.php?t=381220&page=2 )
On your described solution: I removed the Vista/Snapvue partnership and the usb connection on both sides. But I am not able to do the next step: "Remove NDIS Share connection" in device manager, because it's not there (see attached screenshot). Does this mean it was never there, so I do not have to uninstall it? Or is there a different way to find it?

Hi.
Reset Vista to ensure It boots correctly. Then wait to be 3g connected. Once you are connected the device "Remote NDIS shared connection" should be there under network cards. Then uninstall it and reset again. Once booted you have to wait several minutes until vista detects it again and installs drivers.....
pd. And try to contact HTC. Maybe (only maybe) if HTC is reported with same problem from many people they releases a fix.....

Hi there,
That did not help at all!
Waste of time.
But thanks for the hint.
What DID help for me was closing WMDC through taskmanager.
When you just exit WMDC, task manager still shows that it is running there in the background and apperantly scanning your ports for mobile devices ore something.
I stopped it from running and have a stable connection now.
(replying from train right now)
greetz,
Pfeffa-rah

Pfeffa-rah said:
Hi there,
That did not help at all!
Waste of time.
But thanks for the hint.
What DID help for me was closing WMDC through taskmanager.
When you just exit WMDC, task manager still shows that it is running there in the background and apperantly scanning your ports for mobile devices ore something.
I stopped it from running and have a stable connection now.
(replying from train right now)
greetz,
Pfeffa-rah
Click to expand...
Click to collapse
Hi
Do you have to do this each time you start vista?
Cheers

firedup said:
Hi
Do you have to do this each time you start vista?
Cheers
Click to expand...
Click to collapse
I think you only have to do it after you used WMDC. On my shift it doesnot start at boot (not anymore...) If I want to sync shift or my kaiser, I need to startup WMDC manualy.
grtz,
Pfeffa-rah

My experiences so far.
Is it possible that it is the energy plan that is responsible for the loss of connection. I installed SP1, no problems it seemed. Today I wanted to use the 3G connection with the battery (balanced energy plan). And then it started to disconnect and to connect in small intervals. I did the routine Daniel described: uninstalled NDIS driver. Reinstalled it but connectivity problems remained.
Is it something to do with the battery powered system?
Because, as soon as stop using the battery, plugging in the power adapter again everything seems to be okay. I am not sure about it, but I think, when I use the max power option with the battery the connection stays and fails when I use the balanced energy plan.
So can it be that something in the energy plan is responsible for the loss of the connection?
Experts, does that make any sense?
I will give it some more tries.
S.

I had the High Performance powerplan on all the time......

had it to
Hi
This is a problem when sp1 is installed and you are using 3g in vista being in balanced or power save power plan. it has nothing to do with activesync and usb ports (i have never had a connection)
i called htc yesterday, they clamed they had never heard about it before, so please as many as possible call htc and tell them then maybe just maybe they would release a fix
in rhe meantime i uninstalled sp1 and everything works

In my case the solution is quite clear.
3G works in Balanced mode and in High Performance when power is plugged in. I am not so sure if it works in “Power Save” even when on power.
3G does not work when either on “Balanced” or “Power Save” when using the battery. Battery works in “High Performance” even when all the options are set like they are in “Balanced” mode.
This I found somewhere else in the forum. It is from Daniel and I guess he says the same, more of less.
Well. I ve been doing many tests and changes and I thing the sd, suspend crashes and 3g closed connections are gone.
I use equilibrated energy plan but I hadn’t any issue when ac connected so I ve modified this plan to make equivalent the behavior when not ac connected, but not success. The problems are still there. Its incredible because the configuration for ac connected/disconnected is the same I ve modified all the parameters (usb, expressPCI, , etc)
So I ve set High performance plan and I ve modified it a little bit, only screen brightness when no ac connected and now all works correctly. I start the system (no ac connected). Then I suspend / wake, hibernate/resume the system several times being ac no connected and the problems are gone. 3g connection is very stable. No crashes from standby to hibernate state. No sd missing problem. So by now I will keep in this "High Performance" modified state
pd. So It seems that a plan is compounded by customizable parameters by the user and hidden parameters)
Now, those who have not installed SP1. Is this really no issue for you? Or have you always been on power or always used “High Performance”?
Well, even when I plug in my external battery and the green light indicates that the machine has been plugged to power, even then it only works in “high performance” and not in the two other modes.
Very strange!
S.

Related

Activesync Disconnects

Hi,
I have been suffering with a persistant Activesync connection problem. It usually connects and syncs fine the first time I boot my machine, but after around five minutes it almost always disconnects (though my Vario II continues to charge). Unplugging and replugging the USB cable does not work and the Activesync icon remains grey. Trying to start the connection manually either from the Vario II or from Activesync on the desktop also does not reconnect the device. In fact the only way to get it to connect again is to reboot my PC.
I'm using Activesync 4.2 downloaded from Microsoft this morning. I've tried deleting and recreating the partnerships, which does not help the issue. I've tried several USB cables which also do not resolve the issue, so I am now asking for your help.
If anyone has any insights into whaty might be happening I would appreciate your help...
Thanks,
Chris
I'm having the same problem, but in my case unplugging the cable from the device and plugging it again usually restarts the sync. Sometimes, however, I have to soft-reset to get it working again. Very annoying.
Hi Chris,
Ive had tons of issues with activesync on my works laptop..... I use a VPN and zonealarm... I used to have tno issues but since I got WM5 wich uses IP address's it always does the same thing as yours.. ive made sure the IP address is allowed in zone alarm.... my colleague also had this issue.. he managed to solve it by using a differnet USB port as his laptop has 3 one is on the side of the machine ... try using a different USB or disable zone alarm if you use it this could be causing the problem.
I sometimes get it to work if I have no VPN client running but as soon as I do use it the active sync stops.
Hope this may help you
James
I have exactly the same issue with my Vario II, never happened with my Vario and I have changed nothing other than my phone. Makes me think its summin to do with the harware possibly? Anyone else found a cure for this?
I Had the same problems, so I gave up on USB connection with active sync, I have 4 USB ports on my laptop and tried all, I now use bluetooth and works everytime.
There has always been problems with USB and actgive sync, so 4.2 was suppose to fix, but not for me.
I've got the same probelm on my Tytn. I've solve it to delete the Pocket Mechanic :shock: , I've done a S.R. and from now on the A.S. works correctly.
Ciao, Cesare
Had to use my old vario for a bit today, used activesync and it worked fine for the whole time I had it plugged in, got a new Vario II replacement today, got home and its exactly the same, would appear to be a mismatch between Vario II and activesync 4.2, can I connect by wifi?
Hello hmm the problem is if it uses direct or ip ,try go settings - connections - ( usb to pc ) and disable advance network funtctionality.
Hope that works
thanks
I had this problem too - I disabled advanced network capabilites in the "USB to PC" control panel under the Settings/Connections folder, and then Activsync stayed connected after that.
HTC TyTN 7/22/06 ROM
Just given that ago, Took me 5 attempts for the usb to pc connection settings screen to show up but then I realised it had to be plugged in to do it! Duh! What features do I loose by disabling ADVANCE NETWORK FUNCTIONALITY?
After the activesync working fine with my orange spv3100 for 4 weeks it suddenly refused to connect. I un-checked the "advanced functionality" box as suggested and it works again. Many thanks for the solution peeps.
I too would like to know what functions this deactivates.
Same problem, I've installed ActiveSync 4.5beta and now it stay connected, sometimes it disconnects but after restart of the phone it works again, one friend told me that the problem comes from the Activesync in the phone, so may be we have to look for the problem in the phone not in the PC
Activesync 4.2 problem
Hi all,
I too started having the same problems with Activesync 4.2 hanging my phone if left charging overnight. I decided to disable the advance network connection and that worked for a while. Now the phone wont sync AT ALL. It charges, but I can't do anything else. I reinstalled the Activesync 4.2, did a soft reset, off-on to the mobile, turn off-on my computer and still nothing. I will d/l Activesync 4.5 beta to see if that solves the problem, but it looks to be a problem with the Activesync in the mobile and not the one in the computer. I did the troubleshooting and it is detecting the USB connection but does not sync. I would really like to know if wireless sync can be achieved. Will post any fix if I find one. BTW my mobile is about a month and a half.
activesync always disconnect
fantastic_mr_q said:
Just given that ago, Took me 5 attempts for the usb to pc connection settings screen to show up but then I realised it had to be plugged in to do it! Duh! What features do I loose by disabling ADVANCE NETWORK FUNCTIONALITY?
Click to expand...
Click to collapse
hi,
where can i find ADVANCE NETWORK FUNCTIONALITY
pls help here im tired of this activesync problem
thank you
Sync problems with tytn
I've read through all the messages in this thread and wondered if someone could help me with some problems i've been having with syncing mine with a laptop. Often when I have the device plugged in when i boot up the laptop activesync won't start until i've disconnected the usb cable then reconnected it again-i never had this problem with the imate jam. My second problem arises when sometimes it says on the files section that there are un resolved items???? i then try to resolve the issue and a wizard comes up with add or remove buttons.afraid that i might remove something essential i tried the add button hoping this might resolve the issue-it didn't. i then gave up as nothing worked. after switching the laptop off and then syncing a day later there were no items to resolve so what exactly is happening. how can there be unresolved items one minute and nothing the next.also i hadn't done anything different on the tytn.if i select the add button on the window does it add a copy of the file highlighted and could this affect the operation of the device.Sorry if this seems a little confusing but i never had this problem with an xda exec or an imate jam.
please could someone help a non technical fifty something.
activesync always disconnect
fantastic_mr_q said:
Just given that ago, Took me 5 attempts for the usb to pc connection settings screen to show up but then I realised it had to be plugged in to do it! Duh! What features do I loose by disabling ADVANCE NETWORK FUNCTIONALITY?
Click to expand...
Click to collapse
hi,
where can i find ADVANCE NETWORK FUNCTIONALITY
I agree, where is this option?
I'm running version 4.2 and along the top bar all I'm seeing is:
File - View - Tools - Help
Nothing like "Settings" and/or "Connections" in sight. Under "File" there is the "Connection Settings" option, but nowhere does it mention "Advanced Networking Functionality".......
Can someone explain this please?!
The "Advanced Networking Functionality" is on your phone, not on desktop's activesync.
On WM5, go to Settings -> Connections -> USB to PC and you will find the "Enable Advanced network functionality" option.
pof said:
The "Advanced Networking Functionality" is on your phone, not on desktop's activesync.
On WM5, go to Settings -> Connections -> USB to PC and you will find the "Enable Advanced network functionality" option.
Click to expand...
Click to collapse
Every time I try that, I just get an error message saying: "Failed to disable RNDIS to use Serial".
Has anyone else seen this message? Happens regardless of whether the Vario II is connected by USB or not...
Thanks,
Chris
I'm still getting the RNDIS error, has anyone else come across this? Is there a solution?
Cheers,
Chris

Continued Vista connection problems.

Hey guys.
Been following the instructions for WiMo 6 and all working
I am however experiencing connection issues in Vista. Basically I boot up and after maybe a minute i get the 'connection' beep and the network adapter icon shows internet connectivity. This will then cycle in and out approximately every minute, the connection beep followed by the red cross on the icon followed by reconnection.
I've noticed in WiMo that Activesync keeps starting even after I kill it in task manager.
Any thoughts anyone? Running on Vodafone Sim and also T-mobile.
On a non related note i am also experiencing the loss of SD Card after hibernate standby that others are. 4 Gb Sandisk SDHC.
Same here. Any idea? I ve trying to disabe activesync usb connections.....but no success
I used to have the same problem. It could be caused by the use of the SD card. I have also uninistalled from device manager the NDIS connection. And restarted.
Many regards.
Try this. I worked for me. I hadnt more disconnections since I did it
Hi,
I did some changes and It seems (by now) the problem is solved. I ve playing with continous 3g connections. This is what I did (I dont know which one did the trick).
1) Disable activesync usb connections for both sides( I did it for vista side days ago but know I did too in snapvue size.
2) Sevice Sync bluetooth Server stopped and set manually.
3) Reset both sides
Now I ve a stable 3g connection....
Edit/Delete Message
Click to expand...
Click to collapse

Hanged Remote ndis based Internet sharing device

Hi.
I have a problem with Remote NDIS (3g Connection on vista side). I ve tested it with and without Vista SP1. When the device is suspended or hibernated much time (one hour or more) and resumed again then I havent conectivity (50% of cases). When I click on "Solve Problems" in network center I get a message saying that REmote NDIS could be not working correctly. I dont find a a way to reset this device(remove NDIS). I reset SnapVUE side but no effect. I try to disable the Remote NDIS device to enable again but system cant perform this operation (mouse icon keeps spinning). When I try to restart vista side It cant to it. It stays for ever showing the screen "Shutting down the device" so I ve to force it. Any idea? Its my second Shift and same problem in both...
and old thread i know..
but i was wondering if anyone had found a solution to this type of problem?
i too have the same issue, i used to run vista on it, but now it's running win7 sp1. same issues.
changing winmo roms seems to have helped, at least it disconnects/disables the ndis adapter less often i think. maybe it's just a plasibo affect...

ActiveSync/PCtoUSB Problems

Hey guys,
i've got a very big problem.
I dont know why but every time i connect my Blackstone to the Computer it always open the "Internet Sharing" thing. Ive changed it over "Settings" back to Sync (and in settings/connections/USB to PC, check "Ask me first about USB connection type when I connect the device to the PC" also), but no change.
Then i canged in the registry the following key "HKLM\Software\HTC\USBToPCPopUP\" DWORD: OnlyTwoChoice=1
now the HTC Popup with the option "Sync" and "HDD" show up, but when i choose Sync it doesent connect and sync.
I want my three Options back and want the option that i can choose out of "Sync" "HDD" and "Internet Sharing"
Thank you
greetz
I started getting this problem when I used the Internet Sharing option for the first time. From then on it would automatically try IS instead of Activesysnc, no matter what I did.
I solved it by unticking the Enable faster data syncronization box in USB to PC tab, but this results in a clunky pile of tabs that come up when connecting to the PC.
Unticking the "Enable faster data syncronization" box in USB to PC tab, doesent solve the problem
Hello
I got the same problem where I did not get the "3 choices" screen while connecting to usb, and IS by default...
I just deleted all keys in the registry under //HKLM\Software\HTC\USBToPCPopUP\
and it went back to normal....
Hope it will the same for you..
I have the same problem since a while, but haven't found a solution yet... starting to get a little desperate...
dapezzz said:
Hello
I just deleted all keys in the registry under //HKLM\Software\HTC\USBToPCPopUP\
Click to expand...
Click to collapse
I guess you mean the registry on the device itself?
I been looking for that, but it looks i don't have this //HKLM\Software\HTC\USBToPCPopUP\...
in fact, i'm facing the exact same problem as described in this htcforum.com post:
"http://www.htcforums.com/post5958.html#p5958" (yes, i posted there too )
i'm pretty sure the problem is NOT pc-related, the data-connection fails at every possible system i tested it with (ranging from xp to vista to ubuntu to osX), at least the usb-diskmode worked before on all these systems before... not anymore...
the answer of HTC support wasn't of much help either:
Dear valued HTC customer, Thank you for contacting our Customer Support Center. We are dedicated to providing you with the best quality service and answering all of your questions and concerns. You recently wrote us about an issue that you have encountered with your device. To clarify your issue, you stated that you were unable to connect your device to the PC. . For this you will need a full version of Microsoft Outlook 2003 or newer and Microsoft Activesync for Windows XP or Windows Mobile Device Centre for Vista. Once these are installed simply connect your device to your PC and it will transfer your details to your PC. I hope this is of help to you. If you need any further help we recommend calling for a direct guidance on these steps for synchronising. If the above steps do not resolve your issue, we invite you to visit the support area on our Web site.
Click to expand...
Click to collapse
i suspect them of not even reading about my problem, and just firing some default answer back... not really helpfull.
so i keep looking around for possible solutions for now.
I'm seriously thinking to make use of the warranty, but hate to lose the device for a long periode... anybody has experience with that?
another PCtoUSB problem, i get all 3 options, HDD and Internet Work perfectly, ActiveSync however doesn't. Vista recognizes it as a USB Pocket PC, but Vista Sync Center and WMDC do not, nothing. On HTC i get the charging icon, but not the Sync icon. Also in the ActiveSync --> Connections menu i have "Sync all PCs using this connection:" ticked, however the drop down menu is empty, nothing to select.
in the ActiveSync start screen there's just the fake Microsoft Exchange account, nothing else
Everything was working fine till few days ago :/
dapezzz said:
Hello
I got the same problem where I did not get the "3 choices" screen while connecting to usb, and IS by default...
I just deleted all keys in the registry under //HKLM\Software\HTC\USBToPCPopUP\
and it went back to normal....
Hope it will the same for you..
Click to expand...
Click to collapse
I tried this but still get ICS opening when I connect my device up. It is driving me mad now trying to sort this - I may even resort to a hard reset before the end of the weekend.
The only way I can get sync to work is to disable the faster data sync option.
hmm, every system i test with gives the same result:
the htc device does charge, but the usb data-connection never works...
could it be a faulty connector?
http://forum.xda-developers.com/showthread.php?p=3764541#post3764541
I have the same problem and the above method solves the problem
Hope it helps.

ActiveSync not working (all of a sudden)

Hi All
I searched the Forum but couldn't find a solution to this problem.
1. Came back form holiday yesterday - synced up my HD" with Outlook no problem
2. Tried to do it this morning. By the normal 'connect PC' option didn't come up and activsync icon didn'tr light up on PC
3. Rebooted HD2 and PC..no change
4. Tried to repair/reinstall activ sync, but towards the end of the repair it says 'there was a network error reading from file 'setup/msi'. Guessing that the file may be corrupt, I downloaded it again..same problem..so I can't repair or reinstall
5. There is definitely a connection of some sort as the HD2 begins to charge when connected
Bottom line is that the HD2 is not syncing - and I can't figure out why not.
Any advice appreciated...
Thanks
Do you have a Norton (Symantec) firewall installed? I’ve found that the Norton product can interfere with ActiveSync.
Active Sync not working
Good point..but no. I have AVG installed (and everything was working OK yesterday)
Spooky thing is, I have managed to uninstal, reinstal and reboot..and it still won't show that it's connected with AS even though there is a connection of some kind, cos the device is charging.
Steve
ActiveSync is just a bit crap. It'll do this occassionaly, so if you use it a lot then get used to it.
A restart of the phone, whilst the USB cable is not plugged in, usually does the trick. Only plug it in again when it's fully started.
Also, try setting the AS connection to not allow USB connections, unplugging and plugging back in, and then setting it to once again allow USB connections.
Just messing with it like that usually works for me. Like I said, it's just a bit crap.
Activ Sync
Yeah, I seem to recall I had this problem a while back - I'll faff around with the settings and see if it makes a difference
Steve
stevep said:
Good point..but no. I have AVG installed (and everything was working OK yesterday)
Spooky thing is, I have managed to uninstal, reinstal and reboot..and it still won't show that it's connected with AS even though there is a connection of some kind, cos the device is charging.
Steve
Click to expand...
Click to collapse
Well if johncmolyneux's suggestions don't work then try disconnecting your phone from the PC, restarting both, disconnecting the PC from the network, disabling the firewall element of AVG (if it has one) and then connecting the phone to the PC again.
If that doesn't work I can only suggest removing ActiveSync, totally shutting down your PC, starting up, then re-installing ActiveSync.
I had a similar problem but I was able to narrow it down to Norton in the end but it's a real pain when you don't know why it won't work.
Good luck with this.
I also occasionally was not able to connect with Active Sync, but rebooting the HD2 always fixes that issue. You said that this did not helped you, so try messing with the settings on Active Sync, like johncmolyneux said, also try when plug the usb cable into the device by default it asks you what kind of connection you're establishing (Active sync, data transfer and internet sharing) - try using data transfer, if it connects, unplug and connect it again, this time use active sync.
Reinstall activsync and Try to disable faster data Synchonization on HD2
Active Sync not working (solved)
That'll teach me to not check the obvious! - It turned out that the cable had developed a fault. I changed the cable and it's now OK.
Case closed.
Steve

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