Thanks. Already tried the first two. Don't know about the third mostly because it doesn't start flickering until I am watching for an hour or two. Seems like if it were a issue with the grid voltage that it would occur randomly, not always after an hour or more of watching. Sounds like maybe the fou...

I have a roku 4200X connected to a Samsung TV. When it gets hot outside the roku picture will start to flicker after about an hour of viewing and then totally scramble to black and flickering lines. Only happens in summer when hot outside - inside is always ac controlled to 74. Switching to broadcas...