Recent issue: Overnight the network disappears

I've been using my Airport Extreme base station with no problems for about 10 months. I have an iMac G5 (first generation) connected by wire, and a 15" Macbook Pro that connects wirelessly. My internet connection is DSL.
Several days ago (and directly after installing a security patch to OSX), I had an issue in the morning where my laptop could see the wireless network but got "an issue" when trying to connect. My desktop couldn't see the internet, and didn't recognize the base station when I went into Airport Admin Utility. The center light on my base station was lit white and gave no indication of an issue. I tried to manually restart the base station and had no luck. Finally I tried shutting down the computer and unplugging everything. I plugged back in and everything worked fine.
This has happened every morning since it first occurred.
Any help would be greatly appreciated.
Thanks!
Wic
iMac G5 (1st gen), and 15" Macbook Pro Mac OS X (10.4.10)

I'm having the exact same issue you describe. Everything was fine for months, upgraded to 10.4.10 now the laptop drops off at night even though the connection signal is fine. A reboot of the airport extreme fixes the issue.
Sounds like this is becoming a wider known issue as I'm seeing it pop up in more and more posts.
Paul.

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