IMac Loses Airport Connectivity

Hi,
I have two identical 20" Intel Core Duo iMacs (see hardware review below). One is at home and the other at work. I have been experiencing a problem on both computers where my Airport connection drops "randomly". After the connection is dropped ALL available networks are no longer available from the Airport menu, and won't become available again until after a reboot. I've tried toggling Airport on/off, restarting the router, waiting, and nothing but a reboot works. What is odd is that this exact same behavior happens both at home and work -- the router brand is the same at both locations (linksys) but the models are not. I have noticed that this occurs more often when I'm using more network resources (uploading a large file, for example), but that isn't always the case.
Any ideas as to what is going on? I don't have any 3rd party software on my machines that I believe could cause such behavior.
Thanks.
Hardware Overview:
Machine Name: iMac
Machine Model: iMac4,1
Processor Name: Intel Core Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 2 MB
Memory: 1.5 GB
Bus Speed: 667 MHz
Boot ROM Version: IM41.0055.B08
SMC Version: 1.1f5
System Software Overview:
System Version: Mac OS X 10.4.9 (8P2137)
Kernel Version: Darwin 8.9.1
AirPort Card Information:
Wireless Card Type: AirPort Extreme (0x14E4, 0x89)
Wireless Card Locale: USA
Wireless Card Firmware Version: Broadcom BCM43xx 1.0 (4.80.79.1)
Current Wireless Network: linksys
Wireless Channel: 6
Intel iMac Mac OS X (10.4.9)

Welcome to Discussions, Scott Newman1!
There were a couple of AirPort Extreme Updates (2007-002 and 2007-003) that were meant for Intel-based Macs. I hope you have them both installed. Check your Software Update panel of System Preferences - the "Updates" half of the mini-menu bar to see whether or not they got installed. Even if they did, it will probably be worthwhile to download them straight from Support>Downloads and install them over top of what you have now. I would also do the same with the OS X Combo Update for Intel. Doing all that will not duplicate, will only fill in something missing or flawed.
After doing that, you'll undoubtedly need to delete your configuration and enter a new one using the Network panel of System Preferences. There are a couple angles from which you can approach it with some fiddling. After some fussing, a couple restarts and sitting overnight/a few hours, it should straighten itself out so that you'll never have a problem again. If not, come on back:)

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