Hello,
I purchased Sonos speakers four months ago, and I've had this problem ever since. My Sonos Arc, Sub, and Era 300 surround speakers are connected to my wifi network, and I have a Samsung Q7 Series 4K UHD QLED LCD TV. My TV speakers are connected to receivers when I'm watching something, not to the Sonos speakers I made.
I've made several attempts to connect to Living Speakers, but each time it disconnects immediately. In the interim, my HDMI is connected to my Apple TV.