Help Ads keep showing up on screen

[S7 ads]

I don't know how to get rid of them, I tried running ad wreck and anti virus but nothing please help. They just randomly pop up on the screen by my keyboard so I can't type and they usually stay for like 5 mins at a time

 

[dontpanicbobby]

I had a similar problem on my HTC One M8. A factory reset fixed it.