I'm seeing similar symptoms to this as well. I'll have to get stacktraces etc. for you.
The system was running M1->M3 for several months without issue, after upgrading to GA the server died after a week or so and then would only stay up for a day or so at a time. I upgraded to 3.0.1 and the system had been running fine up until Thursday of last week, now it dies within hours of starting.
OS is FC4, plenty of disk space.