Continuing to document my experience with my hub...
After a week of relatively good experience, nothing to report, no reboots required, just the normal slow response time by time on some motion detection...
Woken up at 7 am with the bedroom lights on. Hub is completely seized up with no dashboard input possible and no response on any page on the Web interface. Managed to reboot using the :8081 port (this has always worked for me). Reboot took a while at 10%,whatever that may mean.
Absolutely NO ERRORS in the logs at all (which ran from 1.32 am until and through the reboot just after 7am). That seems very strange indeed. In all prior cases of seize ups, there was at least some evidence of a few red error flags.