When freezing Windows VMs there is a possibility of getting an error that the guest agent is not available. As described in this bug (https://issues.redhat.com/browse/CNV-54193) it is possible that the freeze of the VM can still occur anyways.
Currently when we get this error we mark it on the snapshot status and retry after couple of seconds. It is possible that next freeze will return success since the previous freeze did happen, but since windows has default thaw operation the thaw will happen too early. But the snapshot will look succeeded with no warning.
In case we get the freeze error we should fail or mark the snapshot in a way to make the user aware the the snapshot might not be optimal. 

4.16

The error happens sometimes, usually soon after vm start.
Note: Even if the error occur it doesnt necessarily mean that the snapshot will not be optimal but we should present some kind of warning.

1. Create a windows vm and snapshot it right after start.

error will be presented right after the freeze fail but after retry it will probably work and snapshot will be completed and ready.

If an error occurred snapshot should be marked with a warning or fail.