Minecraft Server Shuts Down By Itself

My server runs for a few good hours and then sometimes by itself it shuts down. I just come back to the station where it's hosted and the command prompt is gone. According to this website http://canihostaminecraftserver.com/ I can host 27 people including myself although my server is set to 20.

Although I do have quite a lot of plugins: AntiXray, bPermissions, ChestShop, ClearLag, DrugMeUp, Enjin(It checks if my server is online or offline), eTeleport, Grief Prevention, Hoams, iConomy, Inventory, Multiverse-Core, Multiverse-Portal, Punish Control, SimpleServerAnnounce, SpawnPlus, and Warp.

I'm running bukkit 1.4.7-R1 on Minecraft 1.5.1. The server is set to 3 GB of ram. I have windows 7 64 Bit version. The version of my Java is 7 update 17.

Any help is greatly appreciated.

 

If you're hosting a computer-hosted server I'd suggest no more than 10 people at once. Also, the website you used considers vanilla servers, not bukkit.

You probably ran out of RAM and the server crashed. In the run.bat do you have PAUSE at the end?

 

Oh thank you for the extra info. My run.bat looks exactly like this:

java -jar -xincgc xmx3G craftbukkit.jar

 

Do:

Code:

java -Xms1024M -Xmx1024M -jar craftbukkit.jar -o true
PAUSE