No airport connection after waking from sleep

Hi,
I recently upgraded to 10.4.11 from 10.3.9 and now whenever I wake my Powerbook from sleep I lose my wireless connection. I can restore the connection by going up to the menu bar and turning Airport Off and then back on. However, I am looking for a permanent fix.
I have searched this forum and found no solutions which fix this problem.
JP

Okay. I found a solution and thought I would share.
I needed to go into the Network Preference pane and select "Edit Locations" from the "Location" pop-up menu. I then deleted the "Automatic" location and made a new location I named "Home" and all is well again!
So again, if you experience the problem I originally posted about after upgrading or updating your OS, try creating a new "location" in the Network Preference pane. I found it was pretty easy and I didn't even need to re-enter the Airport network info or password. I just double-clicked my home network from a list of networks which appeared when creating the new location.
Cheers!

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