Why does my airport extreme network crash once each evening around 6 P.M.?

Like clockwork, every darned day, my network crashes with no known cause. I'm with Comcast as my ISP but they seem to have no clue - or won't admit it if they do 1 about my crashes. Every service tech they send out has a different possible remedy, like the likelihood of a switch being activated nearby that causes my network to crash so routinely.
Anyone have any experience like this before?

One of the problems with Air Radar and other utilities like this is that it will not display the signals of cordless phones, security systems and even other "closed" networks around you.
As you know, a "closed" network will not display the name of the wireless signal when you scan looking for networks.
This is a popular feature with many users and you can probably safely bet that there are at least 3-4 other networks around you that Air Radar cannot "see".
Other wireless routers are continuously looking for a good channel to use, so while you may have a "good" channel for a time, in a crowded area, some other router will likely jump on the same channels.
Cordless phones change channels continuously so even if you could "see" their signals...(and you can't with Air Radar)....they are tough to avoid.
Did you try different locations with your AirPort Extreme?
Can something from within my iMac be causing this calamity of networking failure?
Nothing that I know of.
Most wireless networks operate on the 2.4 GHz band. A newer Apple router and also routers from other brands will operate on both the 2.4 GHz and 5 GHz band. There are very few networks using 5 GHz so that might be something to think about. The problem here is that your G4 will likely not work on this frequency.
The other thing to think about is having a professional IT person come out to your house to run some scans using pro equipment. I can't say that this will help, but if Air Radar shows 4-5 other signals, you can bet that the pro equipment will probably display over 20 possible sources of interference in your area.

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