I wouldn’t say it’s a common thing, but nothing is impossible. 

That being said, my guess is the signal being sent to the PLAYBAR is no longer one that the PLAYBAR can interpret. PCM doesn’t make much difference, if the TV’s trying to send an unsupported format through the optical cable. 

Optical is essentially restricted to either stereo, or Dolby Digital, and it the PLAYBAR itself can’t handle anything “higher” than that, so if your TV (or source for the TV) is trying to send Dolby Digital Plus, or Atmos, or anything other than just Dolby Digital, that’s likely your issue. 

Many electronic devices that “auto update” are sometimes known to change audio formats without telling you explicitly that they’re doing so. It’s worth double checking both the TV’s audio settings, as well as the device you’re using to feed the TV to ensure that they’re all locked down to Dolby Digital. 

What audio format does the app say is playing on the TV? (For S1 this is buried under About System, for S2 this is right on the Now Playing screen).

Since you say the power cable is buried in the wall are you seeing active LED’s on the Playbar (assuming you have the LED feature activated in the app). If so what color.

Thanks all.  Playbar was working for many years and just stopped out of the blue.  The sound setting has always been set to PCM on the TV, and I confirmed it did not change.  So, I don’t think it’s trying to send anything higher to the Playbar.  However, you mention to check anything feeding the TV to ensure they are locked down to dolby digital.  I will check my Xfinity/Comcast box to make sure.  But, do you think it matters if the source to the TV is set to something higher when my TV is still set to PCM?  I will try another source like connect a playstation to the TV and see if that works bringing sound to the Playbar.

I am able to control my Playbar from the Sonos 2 App, and I did make sure the source is set to TV, and that it autoplays TV in the settings of the app.  I am able to change the source in the App and sound plays just fine from the Playbar, like Spotify or Sonos Radio.  But, as soon as I switch to TV as the source, no sound.

LED on the playbar is white.  And, when I try to “re-setup” the playbar, it does change to orange or green, with flashes, etc, so no issue there I believe.

I will try to get another TV into the family room soon as well and see if the playbar can work with it, just to rule out my TV some more.  So, we’ll see if that helps.

Any other ideas are welcome!  I just have a feeling the optical port on the playbar is the issue.  Whether it’s hardware or software related, no clue.  When I unplug the optical from the playbar and reconnect it, my TV shows trying to connect to the receiver, and then after few seconds, it says no receiver detected or something along those lines.

Hi @dkado33 

Welcome to the Sonos Community!

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 to carry out some real-time troubleshooting.