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I Have a Arc SL attached to a 65” Samsung TV via HDMI ARC.

Our Sound bar shows this issue usually a couple of weeks after plugging the SB out for 20s and plugging back in. This has always resolved the issue for a couple of weeks and then the issue comes back.  I have been on to Sonos support on 4 separate occasions and also provided the diagnostic events - No Joy. Very frustrated considering this is a very expensive SB. 

 

Firm wear - Fully Updated

HDMI Cable replaced : Issue reoccurs

Support suggested changing the WiFI channel, no impact, issue reoccurs

Set the Digital Output Audio Format setting on the TV to Pass-Through, not Auto.

If you only use the TV’s native apps, set HDMI-eARC Mode to OFF.

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