Airport will connect to network but not internet

Hi,
My MacBook air started out working beautifully on my wireless network-high download speeds, solid connection, etc... After about six hours of operation however, it has stopped being able to find the internet consistently, no matter what wireless network I try. I use a NetGear wireless hub in my room, and my laptop is able to consistently find and connect to the network (the hub is only about 3 feet away) but it cannot connect to the internet. Under network settings I get the message "Airport has a self-assigned IP address and may not be able to connect to the internet" or "Airport cannot connect to the internet." I know that the internet is working, because the network works fine for my MB Pro, iPhone, TiVo, and xBox 360. In fact, the MBA is occassionally able to find the internet and get an IP address. Sometimes this IP address allows me to load web pages extremely slow and sometimes I cannot even find google. The problem extends beyond my one network, however, as I have difficulty connecting to other wireless networks. I am on a college campus and sometimes can connect to the campus WiFi, but it again frequently connects without being able to figure out an IP address. Some help would be great.

I have a similar issue. Mine does the same thing, but only if in a specific area. If I'm sitting on my recliner with the Air on my lap, then it will connect, but I can't get to any sites. The browser just stalls.
If I move to the table that's 3 feet away from me, then the internet connects without any problems.
It could be a reception issue with me, or something. I don't know. At first it connected at very high speeds. That was before 10.5.2.
I don't know if the Leopard Update has anything to do with it, since my iMac doesn't have this problem at all. And that has an N card also.
I hope Apple is looking into this wireless issues.
AL

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