Apple TV makes high-pitched squealing noise when in standby
For a while now, my Apple TV (Gen3RevA, iOS 8.1.2) has sometimes made an odd, high-pitched squealing sound, but only when put in standby mode. It doesn't do it all the time, and it's sometimes louder or softer than other times. What should I do?
AppleTV 2, iOS 8.1.2, Gen 3 Revision A