Question about Avast

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Latest version Avast.
WinXP SP3

Have two shields working,
File System Shield
Behavior Shield (heuristics ?)

No web, mail, site or whatever crap.

Three "modules" running in memory:
avast.setup
AvastSvc.exe
AvastUI.exe

I allowed the first one in my firewall, but disallowed the last two.
The antivirus updates and scans just fine,
BUT
The avastSVC.exe module tries to connect to a variable Avast website
every 40 seconds.
    So the question is:
    Why ?
    []'s

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