Server crashing with no errors

[Rantahu]

Title: Server crashing with no errors

Version: 3.1.2

OS: VPS

Java Version: 7

Description of Problem:

The server crashing every few hours with no errors. The CPU and the RAM usage are still at 20-40%. I remove some plugins I wasn't using. The console freezes and if I leave it on tons of messages saying [ip] Lost Conntions appers

The plugins I use is:

AutoAnnouncer

Buycraft

ChestShop

Citizens

ClearLag

CoreProtect

Essentials

EssentialsSpawn

iConomy

ItemDisplay

LWC

mcbans

Multiverse(Core,Inventories,NetherPortals,Portals)

NoItem

Tekkit Restrict

Tim

Towny and Townchat

Vault

Votifier

WorldGuard and Edit

I also get my console spammed with Reached end of stream.

Error Messages:

Error Log: