After applying Microsoft UAG 2010 SP2 released couple of month ago I noticed that the UAG Web Monitor All Events Message ID 108 is repeated all the way and almost every minute as shown below.
After discussing this issue with Microsoft Escalation Team, it turned that its a known issue after UAG SP2 related to group memberships. Microsoft is aware of this issue and they have a private fix for this specific problem. After applying this fix, I didn’t encounter this warning again.
I would recommend anyone having this warning to open a case with Microsoft to get this fix, this case shouldn’t be counted since its a known bug.