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I have an Arc connected to an older Vizio TV. The sound will drop out for 5 to 60 seconds and then come back. I used the HDMI  cable that came with the Arc. I tried rebooting the TV and resetting the soundbar. How do I tell if it’s the TV or the Arc?

Really, the best way is to submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. For what it’s worth (which is nothing at all), 6 months ago, I had two Vizio TVs and had no issues with the Arc at all. 

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.