Brand new ATV3 hooked to a Samsung amplifier/DVD player combo. Latest firmware.
Every time I switch the ATV on, the sound comes garbled, the menu clicks are delayed, with mixed in crackling and white noise. Playing a video results in just white noise for audio or 80-90% noise. Video signal is fine.
If I change the sound settings -- switch from 16bit to Auto or back, the sound gets fixed until the next sleep/power-up cycle.
I have seen this thread: https://discussions.apple.com/message/19618263#19618263
I've tried powering up the amplifier first or vice versa, no change. Seems to only happen via HDMI (video programming). When switching on and using the Digital In on the amplifier (ATV optical out only), the sound is OK (I may have to confirm this but pretty sure I tried it). I have restarted the ATV multiple times. Happened before and after installing the latest firmware (this or last week).
I've also tried powering up with the optical audio cable disconnected -- the issue is still there via HDMI.
Quite annoying to have to navigate to and change the sound settings every time I switch my system on.
So far the solution is to disable the sleep function. The device stays warm to the touch and I am concerned this would reduce its lifetime.