AirPort Extreme Firmware Update 5.0.4

is available for download for the Extreme Base Station only, not the graphite or snow models.

This firmware update fixes an issue where an AirPort Extreme network appears to be unavailable as displayed by the AirPort Menu Extra or the Internet Connection application. This behavior may result from excessive 2.4 GHz radio interference which causes the wireless network to disappear. The update allows the base station to more gracefully recover when exposed to sources of interference.

The AirPort Extreme Base Station will no longer spontaneously restart itself.

There is now no known limit to the number of FTP connections that can be initiated through the base station.

[Dana Baggett via MacUpdate.com]