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radio plays on Sonos. the sound on the TV suddenly disappears 

Hi ​@Josvolkel 

Welcome to the Sonos Community!

If you mean that when you play radio to a Sonos device that connects to your TV, this is expected behaviour.

If the TV audio does not then come back on it’s own when you turn on your TV afterwards, please ensure that TV Autoplay is on: Sonos App » Settings icon » iroom with TV] » TV Autoplay » On (dot to right).

If something else is the matter, please expand your description.

I hope this helps.