I noticed my battery connection wasn't that tight after my battery died one day, so after replacing the battery I tightenned up the terminal and it has been fine since then.

I did have a weird problem a few weeks ago. I went to shut off the car, removed the keys, and the car was still running! Tried to shut it off several more times and the same thing. Couldn't go to the dealer because it was labor day. So I went home and after popping the trunk the car stumbled a bit and eventually died out. Never did it since then though. Weird.