Apple informed retail stores, AppleCare employees and authorized resellers that some third-generation Apple TVs have WiFi issues, according to a report.
If your Apple TV can't seem to locate a WiFi network, join one or keeps dropping connections, you may have one of these defective units, according to 9to5 Mac.
If it is a defective unit, it can be replaced as part of a replacement program that Apple started because of these WiFi issues. Apple said that replacements would be free of charge for up to two years after the device’s purchase date. While 9to5 Mac offered serial numbers of the affected units, there have also been reports on Apple Support community boards that the numbers were inverted, so it's probably best to use the Apple contact page to make find out the correct models affected.
Apple has rarely been forthcoming about its mistakes, but we do hope that this problem is minor one for users.