The Altiris Service (AeXSvc.exe) is using a large amount of memory and CPU utilization was high also. Upgrading to RU2 didn't resolve the issue.
Confirmed that the Sym Agent and sub-agents did update on the Notification Server and Task Servers.
ITMS 8.6 RU2
This issue has been fixed with our ITMS 8.6 RU3 Release. See IT Management Suite 8.6 RU3 Release Notes
If you are still in ITMS 8.6 RU2, a fix for this is available as a pointfix found in the following KB:
235538 CUMULATIVE POST ITMS 8.6 RU2 POINT FIXES