Board Thread:Modded Server Technical Support/@comment-26100798-20160525015229/@comment-25330335-20160526013642

I think it just runs itself out of RAM. If you can increase that, it would solve the problem. 9 GB probably isn't enough to run 50 players. You could also do like the official server and remove some player slots to prevent this happening. Also try decreasing the server render distance.

 SamwiseFilmore (Admin) (Fill My Mailbox)