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About a week or so ago, the following behavior began:

If I haven’t watched TV for awhile, and then begin to, there will be no audio.  If I open the app, the Sonos system cannot be found by the app.  Restarting the Sonos system by cycling the power to the Arc restores everything.  Until the next time it happens.

Insignia Fire TV w/eARC HDMI connection to Sonos

Sonos is the only HDMI connection, cable is secure

My home network is enterprise grade and rock solid

This began suddenly, I have not made any recent Sonos or network or TV config changes

 I used to have issues with the Arc.  When I turned on the TV there would be no sound.  Tapping TV on the app did nothing.  Turning on and off the TV did nothing.  Unplugging the HDMI cable did nothing.  A power cycle was the only way to get TV sound back, but I was able to play music through the Arc while unable to get TV sound.  Are you saying you can’t even play music when TV sound fails?  So the Arc is totally missing from the app?

I have not tried to play music when the TV audio issue is present.  Since the app does not find the Sonos system, I assume that would not work.

Yes, if I open the app while the TV audio issue is present, the app says it cannot find Sonos system.

 Next time the Arc is seen in the Sonos app check the SNR of the Arc.  Gear icon - room with Arc ( under Your System ) - Arc - Network.  It’s best if the SNR is 45 or greater.  Also the Arc uses a 2.4GHz WiFi connection.

Hi @kwiebe 

Welcome to the Sonos Community!

Sorry to hear of this issue you are having when trying to watch TV. I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.

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