Plex not respecting analysis/playback priority

Despite configuration, in practice Plex server triggers very many generic failure to load errors during analysis.

My server is scanning some movies for loudness. The Plex home screen fails to load. Libraries are failing to load. Videos fail to play.

Running Plex on Ubuntu (LTS), with no other significant CPU load besides the Plex snap service.

What configuration?

What does that mean?
Any error messages (what message)?
Given you get to the point of playback failure, you seem to get through the previous Home Screen and library loading errors… does that mean it’s happening randomly/infrequently?
Also… in what client/app do you get those errors Plex Web, some desktop/mobile/big-screen apps…)?

Server logs might shed some light on what’s going wrong.
My server is performing the loudness analysis for a few days now and isn’t giving any trouble (previous beta, Aldo on Ubuntu).