Same issue after installing qts 4.5.4.1787 on TVS-473e. I tried the last three plex versions for qnap 1.24.3 5033, …4931, …4930. 1.24.1 4931 was stable with qts 1741. I think there has something changed in qts for plex. Hope qnap or plex can fix it.
Update from my experience: pms will unreachable after using plexamp.
