Hi heavy,
Unfortunately, some topics can get lost in the mix, it happens... :'(
Your issue;
I am not too sure, but I think it may be more down to your system, not the connection. I used to have similar issues when I used an older computer.
What you could try (if you still want to stick with avast!):
Right click avast! tray icon --> program settings --> 'troubleshooting' tab --> Check: 'Delay loading of avast! services after other system services'
Or if that doesn't work, you could try delaying the update check, using the avast4.ini file, outlined here:
http://forum.avast.com/index.php?topic=1647.msg10264#msg10264-Scott-