Airport bug, lost wifi...

Hello,
I have a macbook pro 15 inch (mid 2009) with snow leopard and for several days, sometimes the airport bug. Wireless internet is cut, it is impossible to reconnect to the network. I can not restart AIRPORT, sometimes it is marked "no card installed". I need to restart the computer, sometimes at least 3 times to find the wifi signal.
I made no program installation, no modification system and I tried five different important wireless network. I tried to delete AIRPORT preferences and then put it back but it did not work. I do not know what to do. I have a problem since "Security Update 2011-005".
The wifi working fine on my bootcamp partition.....so it's not an hardware issue;
thank you

Having the exactly same issue. At least once a day, Airport drops the connection and deactivates itself. Impossible to re-activate it, so I need to reboot the computer (sometimes 3 to 5 times in a row) in order to have Aiport reactivated.
I'm using a MacBook Pro 13" (mid 2010). The problem appeared with an update. It was so annoying that I installed Linux (Ubuntu) and it works just fine, which makes me think the issue is not hardware-related but strictly softare-related.
I don't know if Grégoire found a solution to the problem, but I would be very interested in any clue that might help me out. I've tried every suggestion found on the Apple website, but nothing helped so far. It's been more than a year now... Having a very bad experience with my MacBook Pro...

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I've had to AEBS hooked up and transmitting a Wifi signal for the past 6 months or so. A few days ago I I lost the Internet connection on wifi only. I have an iMac hardwired through the AEBS and it doesn't have a problem connecting to the Internet.
I've updated the AEBS.
I've reset my router and modem.
I've unplugged them for 5+ minutes
I've sworn at them
I've yelled at the dog for trying to bite my feet when I was messing with the wires.
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AEBS connects to ISP (so it says), airport and ethernet show that they are connected but no pages will load. I've screwed around with the DNS address, IP addresses, and everything.
Can anyone help? I'm already bald or I'd pull my hair out.

I suggest starting by performing a "hard" reset of the AEBS. Once that is done, the AEBS should be back to its default configuration of an Internet router.
With the reset done, connect your iMac directly to the AEBS's LAN port via an Ethernet cable. Can you access the Internet now? If so, while still connected by Ethernet, run the AirPort Admin Utility to configure it the way you need it. You can use the following as a guideline:
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o Base Station Name: <whatever you wish or use the default>
o AirPort Network Name: <whatever you wish or use the default>
o Create a closed network (unchecked)
o Wireless Security: Not enabled
o Channel: Automatic
o Mode: 802.11b/g Compatible
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o Connect Using: Ethernet
o Configure: Using DHCP
o WAN Ethernet Port: Automatic
Network tab
o Distribute IP addresses (checked)
o Share a single IP address (using DHCP & NAT) (enabled)
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Thanks for the info.
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I am sorry I was not able to be any help at all besides WANTING to!
Were you running your other wireless machines at the SAME time? And you had nobody in the house using mixers (for drinks or cake and cookie batter) or hair dryers? Clothes dryers....?
While thinking of Brasil and weather- I saw on our public TV station a few months ago- a story about a fishing boat, I think south of Rio de Janeiro, who encountered a hurricane- and only one fellow lived. Ouch!
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