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I have seen several posts of BEAM using HDMI ARC (in my case with a Samsung TV).

Sound works for little bit and then cuts off.

Fixes I usually see are unplug TV and Sonos and replug and try again. That does not fix it for me. I did see something about and update...but my BEAM is updated. I love Sonos...but this is killing me. I wonder if I am still within my return period.

Is Anynet+ (CEC) turned on? Do you have any other devices connected to your TV? What are your audio settings set to on your TV? Have you tried using a different HDMI cable? Does the sound still cut out when you connect using the optical adapter?

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