Losing wireless passwords when macbook sleeps--how to prevent?

I typically use wireless Internet connectivity. When I put my Macbook (running X 10.5.7) in "sleep" mode or when I close the machine without shutting down, it "forgets" the password to the wireless router. When I open the machine it requires I reenter the password. When I shutdown and reboot, the wireless connectivity is fine--ie, it remembers the router password. This has happened on 3 different routers.
How do I prevent this from happening? It is obviously a nuisance.

Have you tried Keychain First Aid? Run the Keychain app and from the menu select Keychain First Aid from the Keychain Access menu option. If that does not work delete the Airport entry for the router and re-create it. Cant think of any other way to solve it.
Chris

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