Hello,
Check the Control log (e.g. Client GUI > View Logs > Control Log) and examine what really happened.
Check this:
Control Log: Information in the Application Control log and the Device Control log.
Logs could be collected and Exported manually, however, could not be sent via email.
However, you can enable the External Logging
http://www.symantec.com/docs/HOWTO55409
SEPM > Monitors > Logs > Type of Logs
Regards,