I have four Vizio displays (P75, 2x P65, M65) each connected to a Playbar setup (with Sub + Amp, with Sub + Play:1s, with Sub, solo) and each setup will experience intermittent audio outage where the only course of action is to turn the display off and then back on.
The displays connect to their Playbar via optical and the sound source is connected to the display via HDMI. Audio out on the display is set to Dolby 5.1 which passes just fine. All audio sources connected, such as Apple TV or PS4, can be affected.
I have been using the Playbar for a long time and prior to the Vizio displays I had used a 2011 Samsung display and never experienced this issue, in fact the Samsung is still setup with a Soundbar and works just fine. I began experiencing these issues about a year ago when I added the first P65 to my system. So I have experienced this over multiple releases of Sonos software as well as Vizio software, all of which is up to date.
Has anyone else encountered this issue? Searches revealed similar but not identical situations.