My Airport Extreme Disconnects From the Cable MoDem Every Few Minutes

Hello,
I start a new topic as my previous title was wrong and there was no suitable answer.
I have had an Airport Extreme for 3 years and it sometimes disconnects after a few minutes. Actually, it more looks like that the Airport crashes: the "PC Link" light on the cable modem goes off, the Airport lights go off and I cannot find my Airport Network any more on my computer.
When this happens, I can either unplug it from the power and plug it back in, or simply move the Airport around a little bit, and it will re-start. Sometimes the problem does not re-occur for a few hours or days, sometimes it keeps happening every few minutes and of course drives me crazy...
Is it because ... :
- ... my Airport has a faulty connection and I should replace it?
- ... there are power surges in my electricity installation (eg this seems to happen when I or my neighbors have air conditioners on, I live in one of those old New York buildings with old electricity installations), and I should get an anti-surge device, or a newer Airport would deal with this better?
- ... of something else? I tried replacing the Ethernet cable between the MoDem and the Airport and it failed, there does not seem to be a source of interference around my place.
Thanks for your help!

I have had similar problems. Not as bad as some of you but usually in the morning I discover that I have dropped onto someone elses wireless they are not as fast. Then I have to troop upstairs, unplug the Extreme, replug it and then everything is allright until the next morning. But it is sporadic. It has run fine now for a few days. This problem has persisted now for a year. And yes I have tried resetting it.
Next month I plan on going to the big city and I am going to take my Extreme to one of Genius' at the Apple Store. I am curious if anybody else has tried that solution and how much it might cost.

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    Hello,
    I have had an Airport Express for 3 years and it sometimes disconnects after a few minutes. Actually, it more looks like that the Airport crashes: the "PC Link" light on the cable modem goes off, the Airport lights go off and I cannot find my Airport Network any more on my computer.
    When this happens, I can either unplug it from the power and plug it back in, or simply move the Airport around a little bit, and it will re-start. Sometimes the problem does not re-occur for a few hours or days, sometimes it keeps happening every few minutes and of course drives me crazy...
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    First, my mistake: I have an Airport Extreme base, not Express.
    Second, I am sorry, I do not think it is interference.
    I lose the connection to the CABLE, not the base, it's like the BASE crashes. How is that interference? It's not about the signal but about the connection to the cable. The cable MoDem does tell me that the connection is lost, as I said ("PC Link" does not blink anymore).
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