Well, it's currently got 8gb of ram dedicated to the server, and I only have 12gb to work with total. We used to have it at 4, but we increased it a few months ago. I'm increasing it to 10GB to see if that helps.
Launcher/pack Version: 2.1.1
Operating System: Ubuntu Release 11.04 64bit
Version of Java: 1.7.0 03-b04 64 bit
Description of Problem: The server seems to run just fine for awhile but then will randomly stop accepting player input, disconnects all users and stops responding with everything but the autosave from the rtoolkit.
Error Messages: see pastebin
Link to pastebin of log: http://pastebin.com/Emc7NWCG