Open a terminal window on the mac and ping the router (eg. "ping 192.68.1.1" or whatever IP address the router is). Leave the terminal window open and the ping running.
Continue surfing until your get kicked off, then flip back over to your terminal window, and let us know if the ping's are now timing out, or if they are still good.
This will help narrow down the source of the issue for further investigation.
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-Scott
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