I'm having the same problem. I was running on 6.12.x since I moved to Unraid in November without issues. Waited for the general release of 7 and upgraded. It started freezing and becoming unresponsive the same day. I had to manually reboot the server to get back online. I went through this about 3 times and decided to try downgrading back to 6.12.14 and the problem went away. That solved the problem and was using 6.12.14 until this past Thursday when I decided to try and upgrade again. . I did a fresh install of 7.0 and moved my config over. Roughly 24 hours later it become unresponsive. I had moved to overlay2 for the storage driver as well.
I booted to safe mode and re-enabled docker. I was going to downgrade so I moved back to the native storage driver with a btrfs vdisk. I decided to hold off on the downgrade right now. It's been online for about 14 hours now. I just installed a container (plex) to see if anything happens. I have uploaded my diagnostics and syslog. I don't see anything in the syslog. It happened around 14:00 yesterday (2/14). I'll also note that when I got a chance to look at the issue, there was nothing on the monitor connected to the server and it wouldn't respond to any keys. The monitor acted like the PC was a sleep and wouldn't wake up.
I'm going to look at the c-states and see.
citadel-diagnostics-20250215-1327.zip
syslog-citadel.log