I got my telly tablet in September 2017,and it worked fine until it updated to Android 7 last week . After updating, I could not turn wifi on, so I reluctantly reset to factory settings. When it reset, I was surprised to find that it was still on Android 7. I am now able to turn wifi on, but the problem now is that the battery life is now only 2 or 3 hours, and it takes about 10 hours to recharge. I wondered if anyone else has experienced similar problems.
Thanks for your reply. The tablet doesn't get particularly hot. When I go into the battery settings, it doesn't normally show the individual app usage. All it shows is the screen usage(presently 53%, wifi 3%, and Google play services 2%. The apps update automatically.