can you try with 12.1.5
Client takes longer to switch locations on Windows 7
Fix ID: 3256174
Symptom: The Symantec Endpoint Protection client takes longer to switch locations on the Windows 7 operating system.
Solution: Optimized the performance of location switching by using a different Windows API.
http://www.symantec.com/business/support/index?page=content&id=TECH224706