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I keep dropping my wifi connection from an Airport Extreme router. My husband’s iBook never drops a connection. I switched to a g from an n network, but still drop a connection after a while on line.
I’m not sure if this will help your problem, but have you installed the latest updates for both the Airport Extreme and your MacBook Pro. that may be a good first thing to try this week Apple released Airport Client software update, and a few months back there was an update to the Airport Extreme itself too. check Apple’s site for the latest downloads I don’t recall exactly when, but my MacBook Pro (2006 vintage) had Wi-Fi reception problems at first, but there was some update along the way that seemed to fix it.
I’m a technician and I noticed this as well. AFTER the wifi card overheats, due to excessive gaming/video streaming, the wifi card has overheated and has not been the same since. It will stop connecting, but I would have to “turn wifi off” for a few minutes and turn it back on and it will work. I don’t think the wifi cards are replaceable though… still looking for an answer to that.