Earlier today Apple released an AirPort Base Station and Time Capsule Firmware update, reaching version 7.6. The update is compatible with all 802.11n AirPort Express, 802.11n AirPort Extreme and Time Capsule models and adds a number of fixes:
- An issue with performance on overlapping wireless networks
- An issue with AirPlay audio streaming
- An issue with configuring multiple entries for DNS servers
Apple recommends upgrading from AirPort Utility 5.5.3 or later. The new version can be downloaded by checking for updates directly in AirPort Utility.