Bought a Sonos Arc, Sounded great but started cutting in and out shortly after setting up. It would make loud popping noises then it started blaring an  alarm sound similar to fire alarm at full volume. Contacted support, they ran a diagnostic, escalated to the engineering department, and was told I’d receive an email. No email. So I sent one. No response. Called again three weeks later, put on hold several times to be told the owner of my claim couldn’t be reached, and I’d have to call again. So I have $900 useless bar, under warranty, and can’t get help from customer support. Who do I talk to that can give me answers?