Wifi (WPA-PSK) not restored after sleep? (10.4.10)

Hi,
Has anyone else noticed that their Wifi connection is not being restored after the MacBook comes back from a sleep?
I'm using a 2006 white MacBook (Core Duo) with 10.4.10, connecting to a Cisco 877W ADSL router using WPA-PSK. Cisco firmware version is (C870-ADVSECURITYK9-M), Version 12.4(4)T7, RELEASE SOFTWARE (fc1), "flash:c870-advsecurityk9-mz.124-4.T7.bin" which seems to be current.
From a cold boot, there is no problem connecting to the wireless router, but after a sleep, the connection is not restored, and the router syslog shows repeated unsuccessful authentication attempts from the Macbook's MAC address.
Connecting manually to the correct network SSID doesn't resolve the problem: it just prompts for the WPA PSK keyphrase, which doesn't work if entered. Of course the correct keyphrase is already in the keychain.
As a workaround, switching the Macbook's Airport off and on again a few times eventually seems to get it working again, but it's slow and very clunky.
Can anyone else confirm this problem? It seems to have been introduced with 10.4.10, but I would like independent confirmation before reporting this to Apple, as I changed the wireless router around the same time as the 10.4.10 update appeared.
Thanks,
- Martin.
PS: I guess there are two morals to this story...
1) Always clone your hard drive to a Lacie drive with SuperDuper before installing any Apple updates - so that you can back out any buggy updates without a full reinstall.
2) Don't install any Apple updates within 2 weeks of installing other network changes - so that you can tell what's caused any issues.

The WPA auth problem still exists on a clean install of Leopard (and a full reboot is needed to clear it every time the laptop comes out of sleep) so I'll ring Apple Support and see if they can at least add it to their known issues list, in the hope of resolution later. It's quite likely that downgrading to WEP would be a workaround, but WEP is just not acceptable from a security perspective.

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Message was edited by: AshleyColeman
Message was edited by: AshleyColeman

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