BIZARRE - Wireless Network Dies Every Day at 4:30pm (???)

This is an incredibly bizarre problem. I've been having problems with my wireless network for about a month or so. What will happen is that when using my Intel iMac, the network signal will increase, decrease etc in the status bar for about a half hour, then eventually the whole network becomes unavailable. The Airport Express light is solid green, but neither my iMac nor my iBook can detect it. I usually work on it in the morning hours with no problem, but almost always this happens around 4:30 pm in the afternoon when I do my afternoon work at home. When it crashes and i type in the name of my network, it just says "error joining the network." The only fix is to unplug the Express and reset it. Doing this every day is getting incredibly annoying. Most times, but not always, I put the iMac to sleep during the day and wake it up between 3:30 and 4:00.
The network will do this other times as well, but almost like clockwork its drops around that time just about every day now. The only thing I ever got that resembled an error message is that once, while using Airtunes, it told me the network stalled.
At first I thought this was the Airport Express hardware. So when it crashed I took it to the Genius Bar and Apple replaced it for me. However,m the new unit exhibited the same problem right away. So it can't be the Express.
Then I thought it was something to do with 10.4.8 because thats when this all started, approximately. So I reverted back to 10.4.7 on both computers...still the same result.
I am stumped and have no clue what is causing this. I've tried changing many of the wireless options in the AP Admin utility but nothing seems to work. I dont know much about manually configuring this stuff (and I dont know much about using terminal commands etc.) so maybe there is something obvious to you 'smarter' people that I simply dont notice.
So it either has to be something to do with a problem being caused from my iMac or my modem. I have no issues using the iBook g4 I use a Motorola Surfboard (SB-5120, on lease from the cable company) which is run directly via ethernet cable to Airport Express. Another coinidence is that I noticed this also happened around the time when Time Warner Cable took over for Adelphia in our area. For the first six months I owned the AX, I never had one problem or had to do any resets.
If anyone has any info on this...PLEASE...any help would be appreciated.
iMac 17" 1.83 GHz Intel, iBook G4 12.1"   Mac OS X (10.4.7)  

Might have to do with your sleep preferences or third party software programmed at this particular time. Jon

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