Server Version#: PlexMediaServer-1.16.2.1321-ad17d5f9e-x86_64.spk
Player Version#: All
Installation of this update to my synology NAS server broke the connection between the disk and the server effectively killing all utility. All media simply showed up in the app as Unavailable to play.
Reversion to the PlexMediaServer-1.15.3.876-ad6e39743-x86_64.spk from April fixed issue.