A bit of an old thread, but I thought I'd see if you guys ever got to the bottom of this. I have reproduced the Hub crash without internet access multiple times. All I have to do is block it at my router and it will crash within days. It's a bit concerning as being able to run Hubitat without having to be connected to the internet was a key purchase decision.
I lost the logs from when it happened last, but if it's helpful I can add it back.
Mostly it says route info- Destination:This Hub, Next Hop:This Hub, Status:Inactive
I noticed that it was pretty much Zigbee devices when I looked closely. Pretty sure bulbs and ikea outlets at that.
Yeah, I started a different thread after not hearing back on this. They figured out it was a bug and fixed it in the last update. So far so good. I think I've been around a week with no issues.