MacBook Air doesn't see wifi if booted in a room where otherwise it has access

If I start my MacBook Air in a room close to the router and then I bring it into another room, the wifi connection remains full bar. However if I restart it in that other room, it won't find my router again; if I display the list of routers found in the area, it won't display mine and so will not be able to connect.
If it would loose connection walking into that other room, I would think this is a range issue, but I believe it's more like a combination of range and some op system or wifi card... whatever issue, not sure.
Also I thought it was due to the recent Mountain Lion installation, but after reinstalling Lion, the issue still remains.
I brought it to the official Apple service and they could not find anything. They guessed it must be an interference issue with the router (doubt it, it's on channel 12, not 6 or 11) or that the router doesn't allow more connections (no such settings, plus time to time it does connect while there are no less computers on the network).
The internal network consists of a router with DD-WRT firmware, a Dell Laptop, an iMac and 2 iPhones, all connect perfectly.
If you need any more detail, please let me know and thank you for your help in advance!

I was looking for an explanation of this, but apparently the MacBook Air doesn't really communicate well with a router on channel 12. As soon as I switched to channel 10 (11 was way too crowded) my problems were gone.
Apparently there might be a problem with the MacBook Air's AirPort Country Code, but I could not figure out how to check it on mine. If you are curious and want to use channel 12 or 13, check out this thread: https://discussions.apple.com/thread/3656144
Hope this helps.

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9:44 pm Wednesday; September 11, 2013
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