Ok. So... It started this morning.
I turned on my tablet and it was just white screen. I tapped the app manager button on the bottom of my tablet (it shows you all your oppened apps) and saw this was an app without a name. This happened more times today usualy after starting up my tablet or oppening an app. Its not only a blank white screen - usually its an advertising.
This really freaks me out since my device is new.
I tryied some antivirus apps but none of them detected anything. I also tryied the virus detection directly instaled in the system.
If it helps you in any way my device is : Samsung Galaxy Tab A 10.1.