this is a great tools that will help you to analyze or diagnose SEP problem. Its called Symantec Endpoint Protection Support Tool. here the screenshot:
The Symantec Endpoint Protection Support Tool is a utility designed to quickly and efficiently diagnose common issues encountered with Endpoint Protection and the Endpoint Protection Manager. The tool can be used either to diagnose problems that you encounter, or proactively to ensure that your computer is ready to install the Endpoint Protection manager or client.
This tools can be downloaded here..
Actually, the tool can also be downloaded from within the Symantec Endpoint Protection client by opening the Client user interface and selecting Help & Support > Download Support Tool.
For full instructions and other technical information, read About the Symantec Endpoint Protection Support Tool.