I'm having a sound issue with 2 of my devices. (I have 5) I have done all the troubleshooting advice you gave, and it still happening. Is there a phone # I could call and talk to someone? I think this started after the last update.
The sound works for a little while then it will start crackle and most of the time the sound goes off altogether. If I am going to watch anything I have to reset, reset, unplug, unplug, 😞