The sound is on mt]y TV. Never paid attention to what is first, lops or sound LOL. Connected with optical cable. removed the optical and still the same. It works fine for a few days after rebooting the box (by unplugging or by reset or even System Refresh) but always comes back.
You are right, the optical goes to my soundbar, which I do not use for watching TV. the soundbar is turned off. I had the Audio set to Auto Detect (Dolby Digital Plus) . I set it to Stereo and will see what happens.