When I attempt to playback a 4K movie from my library via the Plex for Android TV app I receive an error stating my connection to the server is not fast enough, then the client will play the video pausing every 3-10 seconds to buffer.
Bitrate of movie does not appear to be cause as I have tested files 28Mbps - 40Mbps which all fail.
(Movies with the same bitrates except at 1080p play back without this issue).
TV is wired (gigabit)
Server is wired, dual Xeon with copious amounts of RAM so server power shouldn't be an issue.
4K tv shows do not appear to be affected, and playback without issue.