Mi 9T Wifi Issues - Redmi K20 / Xiaomi Mi 9T Questions & Answers

I have been using my Mi 9T Global Version for a few weeks now and im noticing that when i have my phone on standby mode for a few hours and then statr to use it, the wifi is still connected to the router but i have no internet access. What i need to do is disable and re-enable wifi again to have access, does anyone have the same issue and know a fix for it? It is quite annoying. Had a Mi A2 before and had no such issues with that phone.
Thank you all in advance!

I haven't experienced such thing, however what I have experienced is that sometimes the WiFi stops working for a few seconds. It can be annoying when I play with an online game, and suddenly the phone looses the connection for 4-5 seconds. It's rare, in the past 2 weeks it has only happened like 5 times.

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WiFi keeps freezing

My WiFi keeps freezing every 2-3 minutes. I mean that I need to disconnect and connect it, otherwise I always get an information that a page cannot be loaded.I have tried wifi lock, wifi fixer etc. but none of them works as it should. Have anyone found a sollution for this annoying issue?
I have the same problem.. Initially wifi fixer seemed to work, but it doesn't really..

Hotspot disables itself?

Hi folks. OP5 128GB with latest OOS.
When I enable hot spot my device sometimes turns off the hotspot abruptly. This happens while I have devices connected to it.
Anybody have any ideas on how I can debug this, or how I can fix it?
Apologies if it is little to go off of.
Cheers
SonicSamZ said:
Hi folks. OP5 128GB with latest OOS.
When I enable hot spot my device sometimes turns off the hotspot abruptly. This happens while I have devices connected to it.
Anybody have any ideas on how I can debug this, or how I can fix it?
Apologies if it is little to go off of.
Cheers
Click to expand...
Click to collapse
This happened on my Nexus 6p a lot. Might just be a bug with Android/Nougat.
I haven't used my OP5 hotspot enough to notice.
Hopefully it goes away with the next system update. I use my hotspot a lot and it's really annoying to enable it over and over and over. Especially when using a VPN connection!
I use it daily, never got this problem. I even used it last week for 9.5 hours in a row with 2 devices connected, no disconnects at all. I'm on 4.5.5 rooted stock OOS.
I use it daily for around 5 to 7h. No problem till now. I'm on 4.5..5

Wear OS watch will not maintain bluetooth connection to Mi9T

My Casio Pro Trek WSD-F20 always loses Bluetooth connection to my Mi9T after something like 30-90 minutes. The phone still thinks it is connected to the watch (eg, still successfully sends notifications) but the watch says it is not connected to the phone (eg, "disconnected symbol" is displayed, Play store on watch will not open as "you are not connected"). Restarting watch does not restore the connection. Turning watch or phone Bluetooth off and on does not restore the connection.
However, restarting the phone does reliably restore the connection.
Watch and phone (MIUI Global 10.3.12 Stable) are both current on all software. I have done a factory reset on the watch, and repaired after forgetting watch on phone, removing Wear OS app and reinstalling. Problem remains. I am confident, but not completely certain, that I have turned off battery optimisation for everything that matters, even installing MIUI Hidden Settings which appeared to let me do this for Bluetooth. My phone is not rooted, and I need it that way for a couple of apps I use regularly.
What can I do to keep watch and phone fully connected? Thanks in advance.
Had a similar issue with my Gear Fit2 Pro. MIUI kills the process maintaining the connection between the watch and the phone.
I ended up disabling the MIUI optimizations in the Developer settings and change the autostart settings for the "Samsung Galaxy Gear Fit Plugin" (that's the app maintaining the connection between my watch and the phone) to enable and enabled the option to let the app run in the background without any restrictions.
Here is a good information about this stupid MIUI background process killing and how to prevent it: https://www.quora.com/How-do-I-keep-an-app-running-in-the-background-in-MIUI
Good luck
I had that problem when I was running Global ROM. When I switched to Xiaomi.eu, the problem seemed to have gone away.
grantem2000 said:
My Casio Pro Trek WSD-F20 always loses Bluetooth connection to my Mi9T after something like 30-90 minutes. The phone still thinks it is connected to the watch (eg, still successfully sends notifications) but the watch says it is not connected to the phone (eg, "disconnected symbol" is displayed, Play store on watch will not open as "you are not connected"). Restarting watch does not restore the connection. Turning watch or phone Bluetooth off and on does not restore the connection.
However, restarting the phone does reliably restore the connection.
Watch and phone (MIUI Global 10.3.12 Stable) are both current on all software. I have done a factory reset on the watch, and repaired after forgetting watch on phone, removing Wear OS app and reinstalling. Problem remains. I am confident, but not completely certain, that I have turned off battery optimisation for everything that matters, even installing MIUI Hidden Settings which appeared to let me do this for Bluetooth. My phone is not rooted, and I need it that way for a couple of apps I use regularly.
What can I do to keep watch and phone fully connected? Thanks in advance.
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Click to collapse
+1 to this, facing the same exact issue and fixing it temporarily using the exact method i.e. restarting the phone.
PS: I am using Huawei Watch (Classic/Original)
Same here with my Fenix 3HR.
I actually returned the phone due to this. Too many issues with too many apps being killed. And yes I did all the things that should/needed to be done to prevent apps from being killed. Too much work involved per app just to get things to maybe work properly.
Same issue for me using the eu rom. Clearing all data works without restarting the phone. Starting to get annoying.
I have the same problem as OP.
I had it with my Ticwatch E when paired with Redmi Note 4, while my girlfriend's Ticwatch E connected with ASUS Zenfone works great.
Now with Fossil Gen 5 paired with Redmi Note 7 I keep having the same problem.
Does anyone know if the problem happens with Xaiomi Wear OS watches or Amazfit watches?
I fixed it by accepting all permissions on the wearos phone app.
borofanuk said:
I fixed it by accepting all permissions on the wearos phone app.
Click to expand...
Click to collapse
What else have you done? I also have a Xiaomi Mi 9T Pro with stock 10.3.4.0 and I have the same issues. It is becoming increasingly annoying... I am desperate. Wear OS is battery deoptimized in both menus, set to autostart and still the Bluetooth disconnects after a few hours. It is pretty clear that the issue is after Wear OS, as Wear OS app is running , but the phone somehow cuts Wear OS from the internet.
PS: Also have tried custom ROMS... Evolution X does not have the issue, but has other issues (like the fact that Android Auto does not work).
It's fixed! I hoped the move to Android 10 would solve the bluetooth connectivity issues with my Casio Pro Trek watch but did not expect that it would. But it did!
I now have a Pro Trek WSD-F30 in place of the F20 I had when I first made this post. Prior to the Android 10 upgrade, the F30 connectivity to the 9T was just the same as the F20. Bluetooth connection helped for 30 mins or so after restarting the phone then 'dropped' (the phone continued to send notifications etc to the watch, but the watch displayed the 'cloud with a line through it' symbol to indicate it was not connected and would not connect back to the phone.)
The Android upgrade alone did not fix the problem; I also had to 'factory reset' the Mi 9T which is now at 'MIUI Global 11.0.4 Stable 11.0.4.0 (QFJEUXM)` based on Android 10 with the 2020-01-01 Android security patch level. My phone is standard and unrooted though after the factory reset I removed many of the pre-installed apps with Xiaomi ADB Fastboot Tools. The Wear OS app on the phone is set to have 'no restrictions' in Battery Saver and Autostart On. Otherwise everything is just 'as installed' and it all works well.
My F30 has remained fully connected to my phone for 3 days. WiFi on the F30 is set to Automatic and I get 2 days plus battery life (I only got this previously if I had Wifi Off). The watch is now behaving as I hoped it would when I first got it. What a delight.
grantem2000 said:
It's fixed! I hoped the move to Android 10 would solve the bluetooth connectivity issues with my Casio Pro Trek watch but did not expect that it would. But it did!
I now have a Pro Trek WSD-F30 in place of the F20 I had when I first made this post. Prior to the Android 10 upgrade, the F30 connectivity to the 9T was just the same as the F20. Bluetooth connection helped for 30 mins or so after restarting the phone then 'dropped' (the phone continued to send notifications etc to the watch, but the watch displayed the 'cloud with a line through it' symbol to indicate it was not connected and would not connect back to the phone.)
The Android upgrade alone did not fix the problem; I also had to 'factory reset' the Mi 9T which is now at 'MIUI Global 11.0.4 Stable 11.0.4.0 (QFJEUXM)` based on Android 10 with the 2020-01-01 Android security patch level. My phone is standard and unrooted though after the factory reset I removed many of the pre-installed apps with Xiaomi ADB Fastboot Tools. The Wear OS app on the phone is set to have 'no restrictions' in Battery Saver and Autostart On. Otherwise everything is just 'as installed' and it all works well.
My F30 has remained fully connected to my phone for 3 days. WiFi on the F30 is set to Automatic and I get 2 days plus battery life (I only got this previously if I had Wifi Off). The watch is now behaving as I hoped it would when I first got it. What a delight.
Click to expand...
Click to collapse
I can confirm MIUI 11 fixes the issue (I am on EEA version of 11.0.6.0). Normally I never upgrade unless I have very good reasons so for the last couple of months I was using a partial workaround using Tasker to reopen WearOS and reset the bluetooth connection. But I am happy to report this does indeed fix the issue.... so for all of you reading this thread and having a Xiaomi phone -> upgrade to MIUI 11.
Many thanks grantem2000!

Wifi drops when screen is off and fingerprint sensor bad with low light

Hello guys, I bought a Xiaomi Mi 9T last week and I've been noticing a few problems:
1) Sometimes, when the screen is off, Wifi drops, so when I unlock the phone, it says it is connected, but I am not able to navigate the web. To solve the issue, I just have to turn off and then on the Wifi. Do you know how to solve this problem? It's quite annoying, because it happens that I lose notifications.
2) The fingerprint sensor fails to recognize my fingerprint when light is low. Is it normal?
Thank you in advance.
Dalfi said:
Hello guys, I bought a Xiaomi Mi 9T last week and I've been noticing a few problems:
1) Sometimes, when the screen is off, Wifi drops, so when I unlock the phone, it says it is connected, but I am not able to navigate the web. To solve the issue, I just have to turn off and then on the Wifi. Do you know how to solve this problem? It's quite annoying, because it happens that I lose notifications.
2) The fingerprint sensor fails to recognize my fingerprint when light is low. Is it normal?
Thank you in advance.
Click to expand...
Click to collapse
1) Never had problems with WiFi
2) Try if it helps you if you register several copies of the same finger, by (manually) changing the brightness and the angle of your finger.
It may help you for one day but next day when the moisture on your finger or on the display changes, or temperature of your finger (?) or just the Moon changes (or something, who knows), fingerprint detection will mostly fail again.
Very, very bad.
Probably it works better for small fingers - they have small fingers and they didn't think of other people who would have bigger fingers.
Not much help here
Hello I have even worse WiFi problems. In addition to losing WiFi connection I have to reboot my phone every time because Mi 9T can't connect to my own saved WiFi anymore.. Even tried factory reset which didn't help.
Miui 11.0.5.0. QFJEUXM
do you have enetgy saving on? also on wifi settings there is an option to turn off wifi when screen is off

Wifi connectivity issues

All day today I have been having Wi-Fi connectivity issues. None of the other devices in my home are experiencing this. It is just my OnePlus 8 Pro that keeps dropping Wi-Fi and refuses to load games. While I'm on Facebook or any other app it refuses to load. It doesn't matter what frequency I am on or what channel I am on. It is not my service provider I have already called and asked. I think something is messed up. So is anyone else having Wi-Fi problems on the OnePlus 8 Pro?
Do you have a private DNS active?
Same here
dgunn said:
All day today I have been having Wi-Fi connectivity issues. None of the other devices in my home are experiencing this. It is just my OnePlus 8 Pro that keeps dropping Wi-Fi and refuses to load games. While I'm on Facebook or any other app it refuses to load. It doesn't matter what frequency I am on or what channel I am on. It is not my service provider I have already called and asked. I think something is messed up. So is anyone else having Wi-Fi problems on the OnePlus 8 Pro?
Click to expand...
Click to collapse
Mine will only stay connected for short periods. If I put it down and leave it for a while 9 times out of 10 it's swapped me back to mobile data. I've reached out to OnePlus to see if it's a fault or a known problem they're working on.
This is actually happening to me as well. 10.5.8 stock rooted. I see that exclamation point next to the wifi signal sometimes and nothing else in the house is having issues.
Okay so this is what you have to do to fix the problem. Click onto your Wi-Fi and let it go into the settings then swipe up on your screen and go into the app info. Clear your cache. Turn your Wi-Fi off and back on and it should work just fine
I have a much better fix. Change your MAC privacy setting to "Use device MAC" and change from default "Use randomized MAC". Wa la I haven't had a drop all day. This has been driving me crazy!
It might actually be a really simple problem with a simple solution, just i need to see a screenshot with the diagnostics, or the troubleshoot from the device why doesn't it want to keep the connection steady. You can actually learn all these things related to the wifi and some little programming things really easily, it is not that tough, trust me. I took the cisco programming course from SPOTOclub.com, during this pandemic, and in one month i was already an expert in the wireless connection and the LAN and so on and so forth.
If you're having Wi-Fi connection problems or see an Wi-Fi icon with an exclamation point Wi-Fi problem, try the solutions below:
Make sure Wi-Fi is on. Then turn it off and on again to reconnect.
Make sure Airplane mode is off. Then turn it on and off again to reconnect.
Press your phone's power button for a few seconds. Then, on your screen, tap Restart Restart.If you don't see "Restart," press and hold the power button for about 30 seconds, until your phone restarts.

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