SvcHost.exe - blocked by SEP

For approximately the last 3 monthe I have been getting the following notification from Symantec Endpoint Protection :

"Traffic has been blocked from this application (svchost.exe)"

I am a "nubby" when it comes to sorting out issues as the symantec software normally looks after incursions to my systems.  What is happening here?  Is my network and systems under seige from an outside entity?  What can I do to understand what is happening and how can I deal with this notification.  it 's frequency of occurence is increasing.

Thanks