Only iMac gets kocked out by interference

Only the iMac seems to get knocked out by interference, the iBook, xBox, & dark-side pc all maintain good signal strength, all the time, for weeks on end. If I move the iMac, and/or move the AEBS, and/or change the channel, I get the signal back full strength, but then after a while it begins to fluctuate and eventually stop again. Last year when I had this problem, I bought an Airport Extreme (I had an older Airport 802.11b), and that appeared to fix all my problems for quite a while. But eventually the fluctuations and signal loss came back. I thought that I had it solved a few days ago (actually did for a while with the help of Donald Morgan & iFelix) - but the signal eventually stopped. The iMac is only about 5 feet from the AEBS, and I currently have it connected to the AEBS via ethernet. The dark-side pc is right in the same room.
Why would I be getting interference problems with only one of 4? None of the others seem to fluctuate or lose signal strength, no matter how I move the AEBS or change its channel. Note: I had signal strength problems with the iMac, iBook, & dark-side pc just before I bought the AEBS (i.e. I was having signal strength problems everywhere when I only had the older 802.11b Airport). The Airport Extreme really solved a lot of apparent signal strength problems, but now it doesn't seem to be able solve the iMac signal strength problem. iFelix had suggested going to another 802.11x series, and that would no doubt help, but my problem seems to be only with one Mac. On the average, I am without signal now >90% of the time :^(
Does this sound implausible? Can it really happen the way that I am describing it?
Gino

Thanks,
I found "Log out after [60] minutes of incativity: checked under System Preferences > Security & Privacy > Advanced. I don't remember checking that but I assume that will fix my problem.

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Only iMac gets kocked out by interference

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