Virtuozzo running on VM and VM freezing up - how to resolve?

Hi,

We have created a series of VM's and installed Virtuozzo on each of them, on some of the nodes we are experiencing an issue whereby, the VM will completely freeze. It doesn't exhibit high CPU or Memory usage just before it freezes and the only way round it is to reboot the VM. We didn't have this when we used physical nodes.

Does anyone have any suggestions?

Thanks,

Jacob