Please forgive my ignorance re this issue. I have a mobile phone (Sony Xperior XA) that I have essentially 'handed over' control of to my very young son after upgrading to a better one for myself. He has of course installed trillions of apps and games on it, which I have no problem with/that was the whole idea of me upgrading to a better phone.
The problem is that now, every time we turn on 'his' phone, all sorts of random 'video ads' begin to play/are 'streamed to the phone', for no apparent reason. To be clear, this happens BEFORE any specific app or game is opened/activated. I have dutifully gone through the entire list of apps in the settings menu and deactivated any 'notifications' associated with any of them, so that is not the problem.
There are some indications that these 'incessant video ads' are emanating from Google, but there are also indications that this may not be the case (?).
My initial question is, has anyone else had a similar problem, and if so did you manage to solve it/how?
I have searched for answers extensively on the net, but doing so is a bit problematic because my problem 'overlaps' with so many very similar (yet ultimately entirely different) problems pertaining to Google-ads, Apple mobiles, laptops, 'outlook profiles', etc…
Any advice about this would be very much appreciated.
I'm suspecting that the phone has adware/viruses on it from one of the multiple apps that was installed.
I would save all important document and images to an external device and 'Factory Restore/Reset' wipe everything.