3G/4G Connection unstable: mobile data active but internet goes down randomly - OnePlus 5 Questions & Answers

Hello guys,
I've had my OP5 for 2 weeks now, quite happy with it so far but I have a major issue with my 3G/4G connection which is very unstable.
When I am connected to Wifi network, everything is fast & smooth but as soon as I switch to 4G/3G, the data is very unstable: sometimes, the internet connection goes down for few seconds or minutes.
I can see the connection is active (3G/4G icon, no exclamation mark), the signal is good (more than 70% in most cases) but the data meter in my status bar shows abnormal transfer rates (below 2Kb/s). After several seconds/minutes of patience, the connection goes back to normal with very good (normal) transfer rates. It can work very well for several minutes (downloaded some HD movies within few minutes without interruption), then goes down randomly.
I already checked the SIM cards, network & APN configuration and everything is correct. I tried on a couple of SIM cards, on both SIM slots and the problem remains the same, whatever SIM card or slot I am using. The SIM card were tested in my "former" smartphone and work perfectly and in areas where the network and signal are stable and do not lose connectivity with my former smartphones, it only happens on the OP5.
I tested on several apps that require internet and the result is always the same: either the app says there is no internet connection, or it takes forever to load... This is not specific to an application.
My phone is rooted with Magisk 13.3, with the original OOS 4.5.8 ROM. I am using Netguard and AppsOps to control the apps accessing internet but I don't think this is the source of the problem because the Wifi works well and apps still access internet through 4G when the connection is up.
Any idea?
Thanks for your help

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The issue I have is that I live in an area with minimal mobile coverage so have to rely on wi-fi connection when at home. Just today my HD2 has started acting up with an issue that I have experienced previously. When I try to update weather, stocks and other apps that require connectivity I get the error message about the dial-up modem being disconnected - the cause is fine as I have no signal but I don't understand why these apps are not swapping to the wi-fi connection. Browsing the internet is fine as is the YouTube app but all others (including email) are failing as they are trying to dial-up.
I have done some experimenting with mixed results:
1) If the phone radio is off (aerial followed by an x) - then the phone will fallback to wi-fi and applications that require connectivity seem to work.
2) If the phone radio is on and it is trying to find a signal (aerial with 3 dots cycling) then it will not issue the dial-up disconnected error - instead it will try to connect but then either time out (for apps like Omarket and Sky Mobile) or will work with mixed results (stocks and weather - although it only updates locations other than my location).
3) If the phone radio is on but there is no signal (aerial followed by exclamation mark) - then I get the dial-up disconnected error on apps that require connectivity (with the exception of Opera and YouTube).
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I presume in the real world i.e. one where one has decent mobile coverage - this issue is unlikely to occur or certainly less obvious to spot
Hey,
If you set up your dial-up connection as part of your WiFi connection ( ISP or Work) and then set "programs that automatically connect to the internet" to the WiFi connection the automatic program will no longer try and connect if you are connected by WiFi.
go to settings-menu-all settings-connections-connections and add a new modem connection to your Work network. You need to get the settings from your service provider or copy them from the existing data connection.
once done, got to advanced and select networks and choose the work connection for programs that automatically connect.
that should help
m.
So in short I would have a single config that contains both the wifi and mobile settings as opposed to the two separate configs that I have at present. I will give that a crack and see what happens.
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