VM Random Kernel Freeze

[Voleatech]

Hi,

I have the following Problem:

I have a few Wheezy VMs (KVM) with a MySQL Database that gets used fairly often (90% reads, 10% writes).
Every few month the VM freezes completely.
No error message, no log file entry, nothing on the console.

I have to stop and start the VM again.

Does anyone have a tip how to tackle the problem?

I am using a gluster storage (3.6.3) and latest Proxmox 3.4.

Best
Sven