Airport connection dropping off when computer sleeps

Starting with the latest 10.4.8 update my airport connection drops when the computer goes to sleep. No amount of configuring will get the computer to recognize my airport. Turning off the power to the airport, waiting, and re-connecting does no good. The only way to get wireless is to restart. Once restarted the airport connection is re-established without any configuration and continues to be fine until the computer goes to sleep. Hard wiring ethernet works at all times without problems.

thanks,
i read the doc, looked in the system prefs where my re-connect was set to "preferred" and there was only one wpa network listed. i deleted it from the list then re-added per the apple document. will see if this works.
in my own mind i don't think this is the solution but am keeping an open mind. the weird thing about my situation is that after the computer sleeps there are no available networks under the airport menu. i know in fact there are 4-6 in my area. after restarting the 4-6, including mine, networks are all there and my network has been connected to.

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Airport connection dropping off when computer sleeps

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