[ovirt-users] VM's in ? Unknown state.

Occasionally I have a single VM go into an "?" unknown state and the only method of recovery is to kill the PID on the host. This happens once or twice a week to 1 out of 500+ VM's. There is no pattern to this and VM operating system doesn't seem to make any difference. Logs are attached. aus02gmovirt01 is the Engine aus02gdc1kvm02 is the VM Host