I have been having issues since the latest server update. All of the following occurs on Apple TV locally from Synology:
Any video file (thats long enough in duration) will stop playing at random locations.
For example, a 2hr movie will stop playing ~ 40 min in. Starting movie to just after that time mark, movie stops playing ~ 20 min later.
This also happens to TV Shows. (30 min in total length). Playback stops around 15-20 min.
Playback location not saved in Plex. When playing a video in Apple TV, leaving playback, then resuming, the location was not saved and video starts from beginning.
Apple TV is not shown in Plex Server Dashboard during playback. See below. Note local bandwidth.