Any error messages?

More detail please. 

Alternative view: watching TV with sound through Sonos, but TV quits sending audio to Sonos. 
 

What tv, what speaker, what connection cable, what connector from tv, ​@Shaben?

I’m wondering, since the OP’s forum setup suggests they have a PLAYBAR, if the TV’s firmware got updated, or a setting got changed, and it is now trying to send a format greater than Dolby Digital across to the PLAYBAR.