This is the official channel to receive support, and they will just direct you back here from Reddit. I would stick to one place (here) so everything is handled in one place and one thread.
I don't think that the C8 is having any more issues than any other series hub. There seem to be a handful of people experiencing lockups. It typically is either a networking issue, or some cloud based integration.
Maybe start with looking at any errors or warnings in your logs tab. Also Device Stats and App Stats in the logs tab can help pinpoint some issues.
Also, what color is the LED on the hub when this is happening? Can you access the diagnostic tool when this lockup happens? Hubitat Diagnostic Tool | Hubitat Documentation
This would be a good thing to try, and it is completely safe to do. As noted, if you are pulling the plug or if you experience power outages in your area, this could have caused corruption in the hub at some point.