@Rocky most like a connection issue, but since you already restarted I think the logs are already gone. If it was a one-off I wouldn't worry about it (but do make sure that the backup is actually working, may be a good idea to do another full backup).
@stormi so now I have to just figure out how to delete the ghost vm before i reconnect the pool to XO. in xen center I can't delete it for some reason .. guess i'll try cli (never deleted a vm like that before)