On my 2nd R635 55 inch. I have a line that appears at the top of my screen when I'm playing my PC at 1440p. This is my first TCL experience so if the 2nd one isn't any better then I'll return this one too and have no idea what else to buy. The first tv also has some weird color flickering here and there only when I play PC. I've tried 2 different hdmi cords and even borrowed a friend's 2070 super to see if it was my 2080ti gpu but same issue. Picture is great otherwise and I'll be very disappointed of I gotta return the 2nd one.