I am using the 5.1 system optical input from a Phillips 4k tv.
It has been making a popping noise after a few minutes when watching Netflix movies.
It does this a few times a few minutes apart then all sound goes away.
When the sound goes away I turn the stereo power off then back on and the sound comes back for a few minutes until the cycle repeats.
The stereo plays audio from YouTube from the same tv all day with no problems.
BTW- Klipsch speakers are awesome.