Apple TV2 unit makes an ultra-high pitch sound every 40 seconds

This just started happening about two hours ago: every 40 seconds our Apple TV2 makes this dog whistle-like sound that pierces through the whole house. Has this happened to anyone else? I have tried recording the sound but the mic on my iPhone can't pick up the sound. (btw, my wife hears it too, in case you thought I was just being crazy haha)

Looks like it was the iPad Mini that was next to my Apple TV2

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