I have a 2002 Ford Focus with 98000 miles. A couple weeks ago I went to start it and the battery was dead. So I charged it, then a week later the gauges all dropped, the airbag light came on and the car stalled. I could not get it restarted. I called AAA and the tow driver suggested I jump it, so we did and it fired right up. Then a mile later it stalled again. The alternator and battery were replaced 2 years ago. Any thoughts?