I think it was my hard drives being "put to sleep" after about 10 minutes or so.
I would come back to check on the miner and it would be dead because of the 0 connections on bitcoin.
Not behind a router, and I can easily see 50+ connections upon starting up.
I have changed the setting that put the hard drives to sleep. Hopefully that will stop it?!
Have you got it sort it out ? because I have the same problem and I have tried the fallback nodes but yet it just falls back to 0 in few moments after starting .. and leaving it online for 24 hours does not solve the problem.
Have you tried port forwarding in your router? It's not necessary according to the wiki but I get way
more connections that way. Currently about 60, without NAT forwarding <10.
That can't really be the reason why it drops to 0 but maybe the problem just vanishes with that change.