I recently purchased a sonos arc which arrived last week, setup as per the sonos instructions and was all working fine.
However i have started encountering issues with the sound just randomly dropping out. This can be when watching TV or using one of the android apps on the tv (Disney +). Also when the xbox series X is set to output dolby atmos the sound drops every few seconds. Sometimes when the tv is first turned on then sound does not come through the soundbar. To rectify the TV audio i have to change the output from Audio System to TV Speakers and then back again. This however does not stop the sound dropping randomly again or the Xbox Issue.
I am unsure which device is the problem, whether it is the soundbar or the TV Struggling to process the sound correctly. However i have never had any of the above issues when using headphones or the TV Speakers.
Setup on the TV:
Speakers: Audio System
eARC mode: Auto
Digital Audio Out: PCM
Pass through mode: Auto
I am also posting this on the SONY help and XBOX help forums.