Dolby ATMOS not stable, drops out and/or Dolby ATMOS option disappears in Audio settings.
Dolby ATMOS is intermittent on my ATV 4K 1st Gen with 14.6. ATV frequently but randomly just stops sending ATMOS to my receiver. Audio Format = Auto. I can recover ATMOS by cycling Audio Format to On which gives you Dolby Digital 5.1, then cycle Audio Format back to OFF, then restarting ATV. Other times the Dolby ATMOS option just disappears from the the Audio Format and of course is then not recoverable via a Restart.
I truly don't understand how the actual Dolby ATMOS option can randomly drop from the Menu as if the software has changed?
Appreciate any feedback, the Dolby ATMOS is a wonderful feature in ATV, particularly in the Spatial Audio Selections in Apple Music, WOW!
My equipment:
ATV 4K 1st GEN tvOS 14.6
Onkyo TXNR696
LG OLED55C9AUA
Apple TV 4K, tvOS 14