Lose internet connection with airport express

I have a powerpc imac G5 and intel powerbook with built in airport and using an airport express for both. I've since moved in with my fiance and she has a PC. We can all connect to my airport express without any problems initially. Every once in a while though I'll lose my connection in all 3 computers. The green light on the express is lit at all times. If I unplug the express and replug and wait for it to reset, all is fine again... for a while... then some days later it'll go out again. Any ideas why this is happening.
Thanks in advance for any help.
J.

Hana, welcome to the discussions!
First thing to check is how much competition you have for the airways in your area.
Download iStumbler, www.istumbler.net to get a look at the other wireless networks that may be causing interference with your system.
Pay close attention to the channels that the other networks are occupying. Then using AirPort Utility - Manual Setup - Wireless Tab, change your channel to a setting that is as far away as possible from the other channels in use.
If you are in a dense area of apartments, etc., it may be quite difficult to find a clear channel. And, most modern routers allow the user to keep their network hidden, so you may not be able to even see some networks. Unfortunately, there are no shortcuts here.
You might also try "interference robustness" under "Options" on the Wireless Tab in AirPort Utility - Manual Setup. There may be a slight speed penalty for using this setting, but if it prevents interruptions, that will be good compromise.
Post back on your progress.

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