[Users] Problem with VDSM becoming unresponsive

Hi I have an issue with a one node ovirt setup with gluster storage. Every so often (twice a week or) the management console show the node as unresponsive. I can ssh to the node fine and it is indeed responsive. I can see the VM processes taking CPU with top. I can see the VDSM process as well. Restarting vsdmd causes the node to become in the up state again, but I have to restart all the VMs that are running. In the engine log file (attached) there is "VDS::handleNetworkException Server failed to respond" error. I am not sure how I can fix this so any help appreciated. Attached is the engine log. Regards Daniel