Lars, you will need better answers from Igor…
If it helps, there are a lot of forums discussing connection troubles (while updating):
http://www.avast.com/forum/index.php?board=2;action=display;threadid=1729;start=msg11101#msg11101 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1696;start=msg10688#msg10688 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1677;start=msg10606#msg10606 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1664;start=msg10456#msg10456 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1611;start=msg10408#msg10408 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1651;start=msg10313#msg10313 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1561;start=msg9590#msg9590 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1479;start=msg8916#msg8916 http://www.avast.com/forum/index.php?board=2;action=display;threadid=1386;start=msg7917#msg7917
Hope any of them could help you…