Every PC game I play tends to have these grey panels, sometimes stripes of grey and black, they have shadows and their sizes vary. It covers up some areas of the game and it flickers and goes away while my character moves. it comes back when I look at a certain section, though. It's hard to describe it without having a picture, I know. but when I try to take a screenshot it just captures a black screen. Please help me. It's very disruptive, it happens 99% of the time and I've had enough of it.