So this is my first posting to this forum. I've had my model S for about 3 weeks. I love the car! However, I am still in the get to know you phase. I, too, experienced loss of all sounds; twice in a 3 day period. The first time it happened I had no idea what to do. I called roadside assistance and they talked me through rebooting. That fixed it. When it happened again two days later I rebooted on my own which again fixed the problem but has me concerned. Why so often? I sent an e-mail to roadside about the issue but have yet to get a reply (it's been 8 days since I sent the e-mail).