AirPort disconnects and cannot be turned back after update to 10.5.7

I updated to 10.5.7 yesterday, and this has already happened to me three times today:
* AirPort turns off completely
* Attempt to turn AirPort back on fails, either from the menu bar icon or from the Network prefs pane
* Sleep and wake does not resolve the issue
* A reboot does fix it, until it dies again
Has anyone seen anything like this, or does anyone know how I can force a restart of the daemon that may mange the connection?

So it looks like I've finally resolved it, after calling AppleCare and sitting on the phone with their AirPort folks a bit. This is what they had me do:
1. Boot in "Safe" mode to force a dynamic loader cache cleanup. (Hold down SHIFT key just after the startup chime. It may take a while to do the dir check and cache cleanup. Hit the restart button when you get to the login panel, or if you have auto-login, once you get to the Finder.)
2. Remove several network-related configuration files from /Library/Preferences/SystemConfiguration and restart:
NetworkInterfaces.plist
com.apple.airport.preferences.plist
com.apple.network.identification.plist
(Note the similarity to Daniel Palmer's note above, but note the specific files.) I should add I didn't actually have to reconfigure anything after doing this since this doesn't wipe out the location preferences. However, things may be a bit different for you.
Let's see how it holds up, but it's working pretty well now.
Thanks all for your help and comments, and hopefully this note can help others of you with similar problems.

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Hello untech,
I see that it has been awhile since you have posted with us on the HP Forums. Please let me take a moment to say "Welcome Back".
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Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
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W a t e r b o y 71
I work on behalf of HP

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