I have a Samsung Q80T and just started with Amazon Prime Video with the built in TV app. There is an annoying thing happening where the screen appears to dim/go dark for a few seconds and then lighten up again.
You can see it here:https://imgur.com/a/K3WqiYKAfter 3s it dims then it comes back 3s later. This can happen maybe 10 times in a 30 minute episode of a programme, and its usually when there is a lot black/dark content in the picture rather than say a daylight scene.
All the auto/intelligent/eco options on my Q80T are off. I also tried turning the subtitles off as I read somewhere it used to cause issues. This does not happen with Netflix HDR.
Software Version: 2102.2, the TV is EU/Sweden version.