Hello,
I agree with ARSharma and pete above. GUP would surely assist you.
Again, You are carrying SEP 11.0.6005.
Not sure if your issue is related to one of the issues which was observed in the 11.0.RU6a, 11.0 RU6 MP1 and 11.0 RU6 MP2 .
Check the Release Notes:
Symantec Endpoint Protection client downloads a full.zip file instead of the delta
Fix ID: 2179554
Symptom: If the Symantec Endpoint Protection Manager server heavily loaded, a client requesting a delta will not get a reply from the server in a timely manner. The client retries again and obtains a "full.zip" file instead of the delta.
Solution: Symantec Endpoint Protection Manager now correctly handles subsequent requests from clients and allows the first one to complete before serving another request.
However, I would advise you to Migrate to the Latest Version of 11.0.RU7 MP1.
Hope that helps!!