HassOS becomes unresponsive every few days/weeks

Every few days my HassOS installation on my NUC becomes unresponsive. No more Home Assistant, no SSH to the host, not a single Docker Container is reachable anymore. Even the HDD-Indication-LED stops blinking. Seems like the whole OS freezes.

The only way I found to fix this is rebooting. Then I exported the OS logs via journalctl. I find the reboot in the logs - but before the reboot everything seems quite normal. What else can I do to debug this problem?

I ran into a similar issue with my setup. After switching the recorder to use a MySql server running on another computer for the recorder in Hass, the freeze-ups ceased.