Happened to me once, I turned the car off and restarted, and everything was fine (I was in a drive through, so I could easily do that right when it died).
I've had the Radio/Climate control replaced since then because of jammed discs, and nothing on the new one. It was strange when it happened. Since I wasn't listening to the radio at the time, it took me a second to figure out what changed. I just knew something had quit, but didn't know what....