MacBook Air will not automatically connect to my home network

Hi.
My new MBA has an issue. Every single time I open it, it says none of my preferred networks is available. I connect to my home network every day, but it refuses to automatically connect. All other computers at home do (MacMini, MacBook, MacBook Pro, and iMac). I select my home network in the WiFi dropdown and it connects just fine. If I close the lid and immediately open it back up, it has already lost the home network connection.
The home network is first in order in preferred networks. Any ideas why this is happening? It's getting to be a pain...
Thanks.

https://discussions.apple.com/thread/3422041?tstart=0
Numerous threads on this issue in the MacBook Air as well as MacBook Pro forums. Unfortunately I've been unable to pinpoint exactly what's the issue, if it is machine specific or OS specific or a particular build of the OS. Mostly because I've been able to replicate the issue across 10.7.1 as well as 10.7.2 on a half dozen different models of machines.

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Unable to automatically connect to Wi-Fi
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