Constantly minimizing

[Geeber79]

My phone constantly minimizes videos such as YouTube or any site I'm on while watching a video on. Sometimes it just closes the internet all together. Even while writing this it minimizes the keyboard. No new apps. And only been doing this for about a week or so. Plz help. 

[BJB77]

I'm having the exact same problem with the screen and it's VERY ANNOYING, any luck with this problem