No wireless after waking from sleep


I'm having an issue with my Powerbook where it loses the wireless connection after it has been sleeping. It was fine, until I installed an update (10.4.2?) that was supposed to fix the said issue. After applying the patch, my Powerbook started exhibiting the issue that was supposed to have been fixed!

I'm using 10.4.2 with all the latest updates, and my wireless connection is secured using WPA. Everytime I wake from sleep, I have to try connecting to my network a few times, before it will succeed. Sometimes, I have to restart because the connection just doesn't happen.

Done the usual things, delete the airport.plist files, check permissions, etc. Still no joy :(