Bit late to the party, but if anyone has this issue I think I know how to fix it. If you are talking about the little white lines which appear when you go around a corner then I fixed it by creating a post process volume, then going to the global illumination (I am assuming you are using lumen, if not then I don’t know how to fix it). Then in the lumen global illumination there is an option called screen traces, turn that off.