My full screen is a pink shade .
My Roku Ultra 4k has also gone pink twice in the last few months. It's on a brand new Samsung. I'm not exactly sure if we were watching YoutubeTV both times. The only way to get it back was to unplug both power, HDMI and make sure the TV was turned off and back on.
5/2/25: This only happens on my Ultra. I noticed that when it happens, the Ultra feels abnormally warm. This also seems to happen after watching YoutubeTV live. To recover I either unplug / replug the power supply after waiting a short spell, or, when that has not worked I've thrown the ultra in the freezer (I'm impatient); this has worked 100% of the time.
Why does what we were watching matter? We have noticed that if you do not exit out of YoutubeTV, it seems to keep streaming the shows and channel you were watching never letting the Roku go to sleep. Making sure to go back to the Roku menu before pressing the power button seems to work well to prevent the issue.