Anyone else running Endpoint ?

Got a 2003 server here running Symantec Endpoint which has been consuming HUGE amounts of data daily (5gb a day). I noticed (using PRTG on our snmp enabled router) that every 15mins or so, 60mb of data was being pulled in via our net connection. Obviously this ramped up our usage.....  looked at EP's configuration and found it was continuously polling for updates etc.... fair enough, but a new 60mb update every 15mins ????

So I have set it to only check for updates once a day...its now checking once every 4 hours but still pulling in that 60mb of data each time.

So Im wondering : why is it doing checks every 4 hrs when its been set to once daily, and what the heck is this 60mb its pulling in all the time ??

TIA