Roku knows his is an issue and their response is basically reboot? It is not the cable nor the hdmi port, it is the Roku device, why are they not addressing? To have people running around with your faulty device and plugging and unplugging it is the definition of insanity. All it does is clear your queue. How about some honest answers to legitimate questions?
As someone says above it is an overheating issue. I turned rocku off watched a movie through my smart TV for an hour or two and rocku worked normally again once I returned to it. When I get a rouge screen my rocku feels hot. I do notice some apps stay open when the TV powers down. So maybe ensuring it's off (rocku) when not in use could stop the issue arising in the first place. .. Maybe.
The problem is the roku. It follows the roku, not the cables or TV. IT seems to mostly happen when it changes from a show to a add or vice-versa. That why many complain about it when watching YouTube. Need to get this fixed and stop blaming everyone's other devices.
Im getting the same pink screen flashes with roku ultra on 2 different tvs. Tv 1 is a 55 inch LG uhd 4k , tv 2 is a 43 inch samsung uhd 4k. Both sets flash green screens sometimes but mostly pink screens. I have tested different hdmi cables. Roku factory cable pink screens. Tisofu 8k 48 bit pink screens, Fusion 8k premium 59.00 pro series cable also pink screens. The problem seems to be with the spectrum tv app. When returning from commercials the screen temporarily goes compleatly pink, then corrects itself. I have not experienced any screen anomaly's while using any other apps. One would think that roku would vet these apps before allowing them on there platform. Afterall this isnt google. But then again they cant seem to fix hardware related issues ie remote controll losing connection with tv volume, they seem to rely on the forum community to solve there short commings.
Sorry to hear that you're having issues. I never did get help that fixed my pink screen issue , so I went to a certain competitor. I've been using them with zero issues. My friend has a Roku Ultra that's about a year old so I'm watching what happens to him. I'll report any bad experiences here.
If you read my previous post you would see that the issue is on multiple tv sets with multiple hdmi cables. The next time i unplug my roku it will be permanent.and its on a 3rd set now. A new tcl r546 oled. Same pink screen on the spectrum app. The spectrum app is garbage and needs work. The samsung version of the spectrum app has no pink screen issues.