After hours of troubleshooting and seeing numerous boxes go down to ridiculous io. This is how we felt: 
We found that map generators like c10t create high amount of swap usage which locks the box up. I guess the new map saving changed how the chunks worked. If you use this, turn it OFF!
The process to watch out for is c10t. We stopped this by shutting down crond on all of our boxes.
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Pick up your very own Mumble server right now for just $0.19 a slot on our Mumble Voice Server Hosting page now or buy any game server we host to get a FREE Mumble server with the same number of slots as your game server hosting order.