My system turned south today for no apparent reason. Running firmware 15.9. Same thing happens on iPad, running 16.6.1 and iPhone. So far it happened on only Atmos songs, have not tried others.
lt plays for a minute or so, and then shows the message not encoded correctly, and then jumps ahead 1 or 2 songs, and repeats. Running Apple Music from the Sonos app. ERA300s set to stereo mode.
Help, this is the first real problem I have had with Sonos!!