03 Exp won't stay running
 

03 Exp Eddie Bauer. 45000 miles,twice in 7 days it will start then die in driveway. Runs for about 2 seconds then it just cranks. Took to a local guy and of course it starts there. He keeps for a day then says he found a bad alternator connection. Cleaned it, greased it and gave it back. it ran good for day then this Sat did it again. Wife took my car and of course it started after that. Took it to dealer and they can't duplicate.