For what its worth, the issue occurred for me last Thursday night after using the reboot option in the dashboard, as instructed by the typical Cloudron notification. The VPS came back up, but the Cloudron dashboard was unreachable. In the VPS terminal, the troubleshooter showed docker was not starting. Two additional VPS reboots did not resolve it, so I simply rolled back, and then everything appeared to be working.
Later that night, Cloudron updated from 9.1.5 to 9.1.6.
When another reboot notification appeared yesterday, I took another snapshot of the VPS before rebooting, and everything came back up just fine.
However, I did NOT delete my cloudron.conf file, and it still exists.
My docker version is 29.1.5, build 0e6fee6.