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I got a Samsung q70t 85 inches. When I plug my Sonos Arc via eARC the sound turn on and off. But, when I use the optical adapter it work perfectly but i can't use dolby atmos. 

Hi @Nodira 

Welcome to the Sonos Community!

Thanks for your post, and I’m sorry to hear you’re having issues with your Samsung TV and Sonos.

There are a few sizable threads on this subject already:

They all relate to the same issue. The short version is, please call our technical support team for assistance.