Literally nothing in your logs indicating what the problem is. Can you keep open a browser console and if this issue happens again, capture what is going on in the browser console.
Jellyfin 10.10.3 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)