MBP internet stalls, other devices are fine

Hi all,
I bought a MBP when I was accepted into grad school a few months ago. I was very excited to make the switch from PC and it has been great for the most part. Unfortunately, things are no longer great.
I have just moved into my new apartment and Charter Communications is providing my internet. My service was activated on Tuesday and I immediately noticed that my internet connection was not behaving correctly. At first I was positive that the problem was Charter. They came out and spent a lot of time of my apartment troubleshooting. The tech's conclusion when he left was that it was my computers fault. I was blown away, and pretty angry... at Charter. My computer's fault? It's a brand new MBP. It worked great on the internet at my old apartment and has been rock solid for the most part. Is HAS to be Charter. After I unpacked my iPad 2, iPod, and PC laptops, I realized that the tech guy was correct.
iPad 2 connects seamlessly to the internet.
iPod touch connects seamlessly.
The PC laptops connect seamlessly.
My 2011 MBP does not.
My girlfriend's 2009 MBP does not.
First, Charter had given me a new Netgear modem/router. They switched it to a Motorola modem/router when they were troubleshooting. This made no difference in my ability to connect.
Specifically, what is happening is that I can see and connect to my network with no problems, but after about 30 seconds of use the internet begins to hang and the web page progress bar will not move at all for 3-5 minutes. It appears I am connected the entire time.
I've looked through a few threads on this forum to find solutions and have noticed a lot of people are having similar issues. I've tried creating another connection location, and removing and re-adding the WiFi connection in System Preferences -> Networks. Again, no improvement.
I'm feeling very desperate at this point. Classes begin soon, and I need to have a laptop and internet connection that I can rely on.
Any suggestions?

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Thanks for participating in the Apple Support Communities.
It sounds like the Mail app on your iPad mini is showing that you have over 500 unread email messages, but your inbox is actually empty.
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Seems we have a similar problem and it is driving me nuts.
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I've searched a bit on these boards, but nobody seems to be having the same problem. My Macbook Air has worked fine since I got it in Sept, and the wireless picked up a fast connection at home, school, cafes, etc. Just recently it started being very slow only at home, sometimes to the point of not working at all, even though all the bars would be full, and doing a diagnositic said all was fine. I tried creating a new location name, renewing the DHCP Lease, and manually configuing MTU to make it '1453.' None of this has worked. The weird thing is, is that my housemates (who both have macs) are still getting a great connection.
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(Also, please note I am pretty stupid when it comes to computers)

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Hey Marco'96,
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http://support.apple.com/HT201343
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MBP internet stalls, other devices are fine

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