AirPort in Intel iMac loses connection and does not see network

I bought an Intel iMac in the summer of '06. I had no problems connecting my airport card to my house wireless network which uses an AirPort Extreme Base Station.
In september I brought my iMac to college and used an AirPort Express as my base station. I had no problems other than that the computer did not automatically reconnect to the network upon start up.
In december I returned home and configured the AirPort Express (located on the main level of the house) to extend the network of the AirPort Extreme (located upstair in the bedroom next to my iMac).
Lately the iMac loses connectivity to the wireless network randomly while the computer is on, even in the middle of using it. Not only does it lose the signal but does not list my network when i click the airport signal icon on the top bar of the screen. Once in a while it will have it listed but will give me an error when trying to connect. The only way I have of fixing the problem is to restart the computer.
I know the airport base station works fine and the network is still there becasue I have a PowerBook G4 that I will put right next to the iMac and the PowerBook will still be connected to the network.
Can someone help?

I have a very similar problem. My machine's airport connection has always been a little flaky, but it's always gone on working. However, yesterday I turned on WEP 128 bit encription. It now connects for a few minutes and then I see the signal strength gradually die until it goes off completely. There are then two ways to get it back working: 1. close the lid, then open it again; 2. tun off the airport, then turn it on again. When I do that the signal strength suddenly comes on full after about 3 seconds. The G4 iMac I have doesn't suffer from this problem. I am using a netgear access port as the base station.
Macbook Pro Mac OS X (10.4.8)

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Leslie Weinberg wrote:
I recently exchanged my Airport Extreme for a Time Capsule. My iMac picked it up immediately. Another networked iMac has been a little bit of a problem, since it occasionally gives me a message that it is not connected to the internet, despite the fact that the network shows up. Through trial and error I can usually get it back on track. My biggest problem is the Powermac G5, which always picked up the network, and which does not see it at all. I entered the name of the network with the password, and got a message that there was an error connecting to it. No network at all shows up in the drop down menu for Airport. What am I doing wrong here???
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AirPort in Intel iMac loses connection and does not see network

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