Losing network connection when computer goes to sleep

I have been putting up with a nagging problem that I hope someone can help solve. (I asked about this earlier and thought the problem had been solved, but it has not.)
Periodically when I start work after my notebook has been asleep, I am asked to reconnect to my wireless network. It doesn’t happen every time, and I have not been able to discover a pattern. I am also asked to re-enter my password, even though it is in my keychain and I always check the “remember this password” box. “Ask to join new networks" is not checked in the Advances pane, "Remember any network this computer has joined" is checked, and in the list of preferred networks, my home network is the top one.
I am not having any problem with the network itself and I am working on the desk where Time Capsule is located.
I am obviously doing something wrong, but what?
Charles

Are you using TC as your router? Or do you have another router?
If another router, update the firmware for starters.

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