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In addition to Apple TV, my system consists of the Arc soundbar, subwoofer and Five in an adjoining room. The system has been stable since I purchased and configured a year ago. Recently (there may have been Apple and Sonos updates) the system does not output audio. Checked Apple TV settings and audio out is set to TV. I can direct audio temporarily to Air Pods but unable to stream sound to the Sonos system. I have a 1 GB ziply fiber connection and have rebooted wifi router, Apple TV etc. with no change. Desperate and it is impossible to connect with tech support at Sonos!

Its an update on he Apple TV. I had to reconfigure mine because there was no audio when Dolby Atmos content was playing after this last update. I left the settings the same on My Samsung TV, but changed the settings on the Apple TV to get it back. 

My only problem now is how to solve the 1-2 second audio dropout every 18 minutes!

Have a look at this post that may help you get the sound back:

Look at the first reply.