My Mac won't stay connected to Internet after Leopard upgrade

Suddenly after upgrading to Leopard, both Safari and Mail report that Mac OS X isn't staying connected to the Internet. I'm using AirPort and a cable modem and it's always been reliable before. But now there seems to be something jumpy/fishy going on in the AirPort menu in Leopard's menu bar. The list of available networks changes very often and although my own network remains checked, Network Diagnostics shows that I am indeed getting disconnected often and for long lengths of time. But everytime I restart my Mac, my Internet connection is restored.
I had fully expected BETTER networking in Leopard, not WORSE.

Jorge
So sorry, I have not checked back to Discussions til tonight. You have undoubtedly solved your problem. But just in case not...
http://docs.info.apple.com/article.html?artnum=107451 is where I learned about Soft and Hard Resetting of the Airport base stations. There is also a Factory reset that's not really on this page.
After I Hard set, I then went into Leopard's new interface for the AirPort Utility. Very straight forward to configure to set your station(s) up again. I've not had a problem since.
Again, soooooo sorry I didn't drop in sooner with this information.
Todd

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