Apple released an updated for the Airport Extreme (AirPort Extreme 2008-003), available from the Software update panel, or directly from Apple Support Webpage. It requires Mac OS X 10.5.5.
While this update was recommended for all users running Mac OS 10.5.5 and was supposed to fix issues with Airport connection on extended Wi-Fi networks; Apple removed it without any reason couple of hours later.
[translation by Linathael]
