Could be the router settings
I had a similar problem on my TWC/Adelphia cable connection. No difference if it was wireless or wired (I keep my antenna greased). When I disabled some of the router firewall options, the problem went away. Give it a shot.
My unproven theory is that now that Firefox and IE browsers block pop-ups, those connections get stuck in the router, and (to use a non-technical term), bog it down.
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