Char stucks

[Corinna]

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Hello everyone,

ive got a problem. I have a simple and clean server on a v-server with:

4 GHz CPU, 120 GB HDD, 2 GB RAM, java 7 installed and mysql, ubuntu narwhale
We are 3 People on the server and playing a little bit. But sometimes, the char can't move, can't write a message in chat, can't logout. The courios thing is, that the aggro Mobs, can see this char and attack him till death. If you would like to go back to town, nothing happend. You have to forced close the client an relogin to play. This happens a lot and I don't know why. No error logs, no java logs, nothing...

Anyone an idea?