Plex lost contact with my Qnap server again. What now?

Server Version#:1.42.2
Player Version#:Version 4.157.0
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

I was watching Plex when it stopped working, saying the server is unavailable. The Network connection works fine.

This reminds me of the mess in September when we all had to reclaim our NAS devices and the process was complex.

What do I do?

Solved it by shutting down the Plex server and restarting. So far so good.