I have experienced similar problems with the - currently latest update 1.13.5.5291. (Plex Media Server installed on a QNAP NAS)
The problems were signalled when I was unable to connect with the plex for samsung app version 1.020; the app hangs during ‘connecting to the server’.
Next I tried to play some videos via my smartphone (Plex version 7.3.2.6276) and I was only able to play one item in roughly 10, videos that were played without problems earlier. The tries didn’t show up in the ‘status’ tab.
I downgraded to PMS version 1.13.0.5023, now I can reconnect with my smartphone; still not possible with plex for samsung app version 1.020
Last but not least, in the ‘sync’ tab, there was ‘you need a plex pass to use this feature’, while I have a plex pass, showing in the my account.
