My LG G3 screen has started acting up. When I am using Chrome, sometimes it will either go all black or a grainy grey with a white squiggly/loopy line diagonally. If I push the off button and then push it again, it will go away. It has only happened once outside of chrome. I had download some other browser apps when this started. I have since deleted those apps and this issue had nearly stopped. Now it does it occasionally.