[ovirt-users] One Windows VM is not responding

Hello Everybody! We have here 13 VMs running under ovirt 4.2.4. Two of them are Windows Server 2016. On one runs a AD, DNS and one application. On the second one runs an SQL Server and also an application. This second one have the problem, that periodical it goes in a state where I get in ovirt the message: *not responding * Beside this the VM is running normal. I can connect it over Remote Desktop. But I can not connect it with ovirt/noVNC, the button is gray out. In a weekly cycle it runs a backup script, maybe this brings some problems, but I really don't know how to debug this. It can be that the VM runs for 3 weeks normal, and then it goes in this state, so I can not really say when this is happen. Also the fact that the other Windows Server VM runs normal, wonders me. Do you have experienced this problem, or do you know how I found out the issue? Best Regards! Jonathan