Hi all: For anyone who's had trouble with Airport Extreme dropping the connection and otherwise behaving erratically, I found, from browsing an Apple discussion board, that Apple released a firmware update yesterday (Feb. 25).
I'm not sure if the link below will work -- just copied and pasted from the document. But it is out there.
AppleCare%20Document%20120191%20-%20airport%20firmware.html
Beth