Do you see any errors similar to these?
[27224] An error occurred while decomposing a message.
[10001] Malloc error while attempting to allocate 7908031 bytes.
[10004] File write error.
If yes, then you may be running into a know issue reported in the following KB article:
http://www.symantec.com/docs/TECH164155
The KB also suggests a workaround to mitigate the issue.
Thanks
Adnan