I have 2 4K Apple TV’s that have been added to my share for over a year recently one of my 2 Apple TV’s will just lose a drive on the share and fail indexing. So I currently have 615 movies and 4K episodes after it refreshes library it will change to 500 movies and less episodes so probably one of the favorited drives but I’m not 100% sure on that. Manually scanning results in an indexing failed after a reboot manually scanning brings all the movies and episodes back.
Again recently started only on 1 device and a reboot is temporary. Newest version of tvOS and infuse