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Whenever I log into steam and refresh the servers list, they don't refresh and instead my internet connection goes kerplunk. I'm really adept at troubleshooting my home network, which I set up and maintain, but this is something I'm stumped with. I can't see that it has anything to do with my settings, but it is in fact something steam is doing to block my connection to the internet. I haven't yet checked whether it affects all PC's on the network or just mine. I can recreate the problem by attempting to do what I described. After a while, or after a reset of the computer, the net works fine again.
EDIT: Hmm... it's been doing it yesterday, and today, but for some reason not right now.