Airport "forgetting" my wireless network with CD2 iMac

I never had this problem with my Core Duo iMac, but now with a Core Duo 2, I have to manually enter my home wireless network periodically after waking the computer from sleep. Is there any way to "save" a network?

Try this:
If you use "Preferred Networks," instead of "Automatic" for your "By default, join" setting, try the following:
- Delete all preferred networks with encryption
- Add them again after manually connecting
It will be faster if you turn on "Automatically add new networks to preferred networks list" under "Options" of the AirPort network connection.

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