This is new. Watching TV. "Alexa, set the thermostat to 65 degrees". TV sound mutes. "OK" she says. Sound stays muted. Volume control doesn't work. Switch to play music. No sound. back to TV, nothing. Ask her a question, she blows my ear drums out because I've maxed the volume out with my remote trying to hear the TV. Yell profanities. Wife rolls her eyes and goes upstairs. Finally unplug Beam, wait a minute. Everything works again. Until I issue another command. Repeat bug. Latest Sonos OS, 2018 Samsung smart TV. Using ARC. Worked fine until latest update.