There are a couple of KB articles about a 1% failure (see below). From the error message I assume this could be a name resolution issue as explained in KB 1034292
http://kb.vmware.com/kb/1034292
http://kb.vmware.com/kb/1035241
http://kb.vmware.com/kb/2006659
http://kb.vmware.com/kb/2014365
http://kb.vmware.com/kb/2019890
André