I have the same issue; xFi gigabit router - both my work laptop and home PC are plugged directly into the router - but intermittently and without any rhyme or reason both will drop internet (at the same time) - this is especially noticable on my laptop as its connected via VPN and everytime the reset occurs, the VPN connection resets (dropping my work). On my home PC I notice it when playing a client/server game like World of Warcraft, where suddenly the game loses connection and I have to reconnect. I've restarted the modem, run Comcast diagnostics and everything is OK per their automated system. But this has been plaguing me for a while now.
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