After 1+ days at a time of working fine, MBP refuses to connect to wireless

A cursory search didn't turn up any identical problems, so I am starting a new post about this one.
I've had this brand new MBP for 4 months or so. In the past 2 weeks, this problem has surfaced. After being connected to a wireless network without incident for one or two days, the MBP will lose the connection with the network. At this point, it will not connect to the network unless the router is restarted. When I attempt to reconnect, it tells me that the connection has timed out. I have tried turning off my airport, restarting the computer, & renewing my lease. No dice. The only quick fix that I've found is restarting the router.
Now, here's the kicker. *At first, I thought that it was a problem with my home router*, as that was the only connection I've used recently. However, I am out of town and have been using the connection in this convention center for the past two days. Today, the problem surfaced again. Because I have no way to mess with their routers, I have walked back to my hotel to type this message. Yes, that's right. Apparently when I move to a new connection, the problem disappears. It seems to be only on each unique network that the problem manifests itself.
Does anyone else have this problem, and does anyone else know a way to fix it?
If you need any clarification or further detail, please ask.
Thank you.
EDIT: I should mention that it doesn't seem to matter whether the network is password protected or not. At home, it allows me to type in the password before telling me that it has timed out about 5 seconds later. At this convention center, the network is unsecured.
Message was edited by: Jon O'Neal

Hi Jon,
Have you tried creating a new network location? Here's a good article explaining the steps on how to do that - http://support.apple.com/kb/HT2712 (the process is towards the bottom of the article)
That would be the first step. The next step would be to ensure all your software is up to date, followed by a reinstallation of the OS. If that still doesn't resolve the issue, at multiple locations, then I suspect there might be a hardware issue with the Airport card. But only after exhausting all of the usual software troubleshooting strategies would I consider a hardware malfunction.

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