ha! this happened to my gs as well, i was driving on the freeway and it turned off lol funny but weird soo i went home parked , later i came back outside tried to start it and nothing :( car was dead. i waited till next morning car turned on and white smoke came out aswell soo i droved it to work like that, when i was going to lunch once again car was dead. I got mad and i started to hit the battery tried turning it on and it worked..soo i decided it was the battery so i went to an auto store bought a new battery and taaaarann!! it worked :) car has been running like new hasnt turned off or died and everything is ok!!