I just found your post and posted my issue just now as well. I am having the same problem on the same server version and TV! My issue might have started some time ago as well, I can’t remember how far back it’s been, but I know it occurred on it’s own without any changes on my end. It seems to only affect my anime episodes that I’m aware of.
To be honest I mainly watch anime, but I am pretty certain it also happens with movies. Might have something to do with the encoding though (X265). Although to be honest I haven’t tested that as X264 content is now kind of rare.