The AppleTV 4K has dropouts on HDR10 TV’s when playing many DolbyVision Titles. The Random singnal loss on DolbyVision titles come from Apple’s improper conversion to HDR10 from DolbyVision for non-dolbyvision displays. This is something that ‘just works’ on 4K BluRay players, and was better pre-TVOS12. HDR10 is supposed to have static metadata for the entire title. That’s the main difference between the two HDR formats. Even though the AppleTV correctly determines that a display is not DolbyVision compatible, it still sends dynamic metadata to those displays. Many displays just have a brightness pop at those changes. Some dropout audio or have crackle and pops. Others, like Sony projectors drop picture. Here’s a YouTube video that shows the problem causing Audio dropouts. I get image dropouts at the same spots in thsee clips. I’ve spent more than the cost of an AppleTV on various cables recommended by Apple ‘geniuses’ trying to fix this problem. It would be great if they would fix their faulty firmware instead of twisting every conversation into an excuse to sell you something. Since this problem varies with software versions, they obviously can fix it, if they care. Before you buy more cables trying to fix this, check and see if your problems occur on DV titles, and if they happen at the same time on repeated viewings.