on my new XBR65X900E i been having this issue for a while now (before the ExoPlayer v2 upgrade). its very distracting while watching movies. the link below is not mine but it displays the exact problem. Also i have attached a player log(movie stars plays at 02-28 18:09:32.736) from the newest Beta(6.14.1.3740-beta) and as well as a sample file. HDR10 play back will be important in the coming years so lets get this worked out. I’m willing to help out as much as possible.
(link to sample.mkv) https://drive.google.com/file/d/1cR6NKlb64MdggmCiMyr_ERqkqGl-GS3e/view?usp=sharing