Thanks for the logs.
From your logs:
Feb 19, 2026 19:02:44.166 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys" (28: No space left on device)
Feb 19, 2026 19:02:44.186 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Pandemonium" (28: No space left on device)
Feb 19, 2026 19:02:44.203 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Tracks" (28: No space left on device)
Feb 19, 2026 19:02:44.220 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Please _ Further Listening 1984–1986" (28: No space left on device)
Feb 19, 2026 19:02:44.230 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Format_ B‐sides and Bonus Tracks (1996–2009)" (28: No space left on device)
These errors indicate a problem with your iNotify table. You have too may folders for Synology/Plex to monitor.
Read through this article and correct your iNotify table.
Note: I see a lot of other issues as well, but we will deal with those after you have taken care of the issue above.