This afternoon have noticed the Guardian screens going WHITE & have also had medm message windows saying:  "virtual disconnect" for h1guardian0.  Jim Batch checked this and mentioned that h1guardian0 has a scary amount of Network Connections (or something along those lines).  Attached is a snapshot when I lost guardian.

An additional symptom I'm seeing is with the actual work station (logged in as ops-->  ops@operator0).  The desktop has frozen up a few times.  I have rebooted this computer multiple times.  Will send an email to cdsadmin.