My MBP 15" late 2009 drops internet while still connected to router

I've had this problem ever since I got this laptop, at first I didn't realize something was wrong and only last year did I realize that it wasn't just my old crappy router.
My Problem:
My MBP drops connection to the internet(1-2 times a day) without disconnecting from my wireless router. This is very odd since the computer rarely goes more than 10 meters away from it and I've never seen this problem on my other machines or my iPhone.
The only temporary fix I've been able to do is to turn my Airport off and on again, somehow the internet works again after this. But still it isn't a proper fix, me being somewhat of a gamer I cannot handle any disconnections over 10 seconds at all or I'll be kicked out of the server
What I've tried:
Checked my network priority list
Zapping the PRAM
What should I do?
Thanks in advance

Latest firmware. No, doesn't happen with other networks. In fact, one of the wireless routers was at work, and I didn't have the problem when it was there. I could stream online music all day without a problem. Then I moved it home & now I do. Very strange.

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
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