SEP Stop command not working

Hi,

We are using SEPM 12.1.4104.4130. all client computers are running Windows 7 and servers are running Windows 2008 and Windows 2008 R2.

While executing smc -stop command it makes SEP service, in services console, non-responsive. Means smc is unable to stop symantec antivirus.

I tried this on 5 diferent servers (Windows 2008 and 2008 R2). Only restarting that server resolve this problem.

Any idea why it is happening.

Thanks in advance

Arun Kumar