It also recently started happening to me.
Last week I upgraded to 1.32.5.7328 on my Plex server, and 7.5.1.8478 on my Plex client (Roku).
Alas, because I upgraded a couple of things at once, I’m not sure which caused the issues.
I’ll often hit pause on music (e.g. when I’m answering a call), and when the screen saver kicks in, it completely loses my spot in the album. It’s rather frustrating. I need to start over at Track 1 of the album.
When I leave it for a long time (such as overnight), the Plex app quits entirely, and I need to restart the Plex app.
Edit: It occurred to me that the screensaver that kicks in is the Roku screensaver, and not the Plex screensaver. (In previous weeks, it was the Plex screensaver.) I’ll try disabling the Roku screensaver to see if that makes a difference.