Was at a red light. Light turned green pressed accelerator then car turned off. Had to take key out and re-insert to turn back on. Radio lights came on but no sound at all in the car. Later that day got back in car and the rear speakers worked but none of the front speakers worked. Another time after turning car on there was no sound whatsoever. Now for days the rear speakers have been working but that is it. Additionally 2 days before this incident I noticed that my Ipod which is wired through a module that basically charges and plays at the same time quit charging but still played through radio. These could be isolated incidents but I would rather get some opinions before my weekend is spent taking the car apart. Keep in mind that Autozone said my voltage regulator in alternator was bad then got a second opinion at a mazda dealership and was told it's good. So if anyone has an idea or has experienced this before please help.