Apple has released AirPort Base Station Firmware Update 7.6.4 ( It’s available for all Apple 802.11n Wi-Fi base stations including AirPort Express, AirPort Extreme, and AirPort Time Capsule. It contains fixes that:

° Resolve an issue that may cause AirPort Time Capsule to report that the backup disk is in use;

° Resolve an issue that may cause an IPv6 Tunnel error;

° Resolve an issue that may intermittently cause a loss in Wi-Fi connectivity with iOS devices.