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No audio from tv amp to arc

I have a sonos amp to tv with in ceiling speakers. All worked fine for a couple of weeks, now no audio from tv but all fine streaming music just no tv audio. I see the sonos amp hdmi connection I even see the equalizer bars moving in the icon on the tv screen however there is no audio .i looked expensively online rebooted both Samsung tv and sonos amp without success. Any ideas?

Remove the hdmi cable, unplug both TV and Amp for 2 minutes. Power them up, replace the cable.