on 13-11-2020 18:55
on 13-11-2020 18:57
You'd be better off talking to your device manufacturer.
O2 customer service aren't trained to fix phone faults.
on 13-11-2020 19:17
on 13-11-2020 19:17
Probably a rogue app such as Facebook
A factory reset might be an option before sending the phone for repair