Windows 2008 R2 servers may hang periodically, and the event viewer shows timeout errors related to SepMasterService leading up to the hang.
Event Viewer:
Event ID 7011: A timeout (30000 milliseconds) was reached while waiting for a transaction response from the SepMasterService service
Windows 2008 R2
SEP 14.0 RU1 MP1, 14.0 RU1 MP2, and 14.2 RTM
Deadlock in Auto-protect.
This issue is fixed in 14.2 MP1 and later. (See Fix ID: 4195080 in INFO5187.) For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec Endpoint Protection.