Samsung subjected me to over 2 hours of troubleshooting over the phone for what I consider to be a KNOWN problem. Both Sonos and Apple referred me back to Samsung.
Nutshell: After purchasing a 4K QLED television, audio loss became a common occurrence when streaming using Apple TV 4K.
Problem: Samsung TV's are not supporting multichannel LPCM sound passthrough like SONY and LG televisions do without any issue at all.
Solution: Either user the apps on the television or set Apple TV to Dolby 5.1. Both have drawbacks and defeat the purpose of a unified user interface, and the best sound quality available.
YET, Samsung still led me through 2 hours of troubleshooting even though I told them all of this!!! Absolutely ridiculous, and now I am seriously considering my brand loyalty now that I find this issue has been ongoing, like their ice makers, for years now.