My Macbook keeps disconnecting itself from the internet

Recently, I bought a Macbook Pro in September and ever since I got it, the connection with the internet have been weird. It keeps disconnecting itself from the internet. I know it's not my router or home internet because my Touch and other laptops have a consistent connection. The Airport icon has a full bar. I can reconnect, but I have to go to Network Diagnostics constantly to connect back to the internet, only to be disconnected 10 seconds later.

Out of desperation, I figured I do a clean install of Snow Leopard (why not since my Macbook is new anyways)! The problem is still there, the Macbook is updated to Version 10.6.1. Can someone help please? Is it my network settings? Is anyone else having this problem? Ahhhh