I'm on the latest TK7 update, and since updating, my mobile data (4G+) has been quite bad. Before the update, I'd had no problems, but now I find that data transfer seems to stop and the only way to sort it is to enable Airplane Mode and disable it again. This Will kick everything back into life for a while, then after a bit of time, it'll stop working properly again.
It seemed to be a bit more stable yesterday after disabling WiFi (wasn't connected to any WiFi network), but started acting up again after a couple of hours. Not aware of any network issues, as others on the same network at work are having no problems.
I've also noticed that the signal strength seems to be a lot worse since the last update. At work, where I got 3 to 4 bars strength, I'm lucky to get 1 now. Even today, my data has been very very spotty at best, with constant airplane mode toggles to get it working.
As I say, others here on EE are having no problems, just seems to be me, and one of the guys is using an S20 Android 10.