I'm running a Tor Exit Node for some weeks now and I've noticed something strange.
every now and then, usually after 1 day of runtime I start to get this message in my ARM log.
14:03:48 [ARM_NOTICE] Relay resumed 14:03:43 [ARM_NOTICE] Relay unresponsive (last heartbeat: Sat Oct 25 2014)
after 2 days those messages span over several hours. I only notice them, when I logon to the server via SSH and view the log.
Even more strange is, that since I'm running this Tor node, there are some time periods where I can't logon to the server. I can ping it, but every try to reach it (SSH, HTTP, even Minecraft) fails.
after further investigation I started to realise that those times where the server is not reachable seems to coincide with the
Relay unresponsive messages from the log.
After around 3 days the server is nearly not reachable anymore, there are only about 2-5 hours a day where I can logon to it. so I have to hard reboot it via my Server provider.
Then everything go's fine for another 2-4 days...
Someone with a similar error: https://lists.torproject.org/pipermail/tor-relays/2013-August/002343.html