Apple has notified its AppleCare employees, retail stores, and authorized resellers that they are authorized to replace the small amount of third-generation Apple TV’s that are having issues locating and joining Wi-Fi networks and then maintaining a connection.
Apple has determined that a very small number of Apple TV (3rd generation) products might experience one of these Wi-Fi related connectivity issues:
Cannot locate network
Unable to join network
Dropped or intermittent connection.
Apple technicians are authorized to replace affected products for two years after the original date of purchase at no charge after verifying that the devices are running software version 5.2.1 and that there are no third party interference issues.
The Apple TVs experiencing connectivity problems feature the following serial numbers:
MacRumors does note that several readers say that Apple has acknowledged that it initially erred in referring to the character pairs appearing the third and fourth positions of the serial number. The listed pairs would actually occur in the fourth and fifth positions.