On a side note, but I'm not sure if that's related. Often when navigating the MAIN tab, some parts of Unraid GUI disappear/freeze: list of disks is missing, cpu load is not shown anymore. It goes back to normal after some minutes without rebooting. But since it happens on main tab where unassigned devices are, I'm thinking it may be the cause of the problem.
tower-diagnostics-20230205-0940.zip