[HELP] error while playing any video [ Screenshots ]

Hey everyone,

I have the samsung tab 3 10.1 3g 15 gb version , attached you can find what's wrong with the videos I play, these lines appear whenever I play any video whether it's on camera or youtube, I instaled other roms and tried all kinds of players, all the same , Please help

Playing games without interruptions

Im currently having a dilemma

Im trying to play games like clash of clans for example that requires constant internet connection without interruptions like phone calls and notifications. Is there any solution? Been trying to find an app or function to fix this.
Of course most of you all would say you could disable the notification for a certain app (whatsapp for example) but that's not what im trying to find. Im trying to find a "gaming mode" lol

Running on 5.0.2 S6
Going to root...soon. Just not now :)

Thanks :)