See my own thread about this issue here: C8 Hub Becomes Unreachable (Again!)
Light remains green but C8 is unreachable and unresponsive. Port 8081 is unreachable. No jumbo frames. On ethernet with wifi not enabled. On UPS. Have swapped power supplies. Have to pull the plug to get it to come back — after which I always do a reboot with a database repair. Nothing in the logs at all. Logs blank from the time I assume it froze until reboot. No error messages. No excessively large states. Tried changing the backup time to avoid conflicts. Etc.
This is starting to happen more often — always when I'm not at home or asleep. But other than that there doesn't seem to be anything in common between instances.
I have Hub Protect, which I understand would give me an extended warranty. The "what's covered by the warranty" link doesn't work, but I took a chance and submitted a ticket last week hoping to get the engineering logs looked at or something. So far I have not heard anything. (Yes I realize there was a holiday and a weekend in between. But I'm starting to wonder if the ticket I entered went out into bit heaven, never to be heard from again.)
