Engine died - first time, now everything seems okay. Help!
 

I have a 2002 Boxster tiptronic and I was driving today in SoCal. It was like 100 outside, going on the freeway with the radio and AC on (just trying to give all the details here). Got off the freeway, stopped at the light and then, at some point (wasn't paying close attention) the engine died. All the lights on the dash were on, just like you were first starting the car up.

Started it back up, seemed fine. Drove more throughout the day, pushing it hard and fast breaking, no problems. Any ideas on this one? I'm pretty concerned, obviously, especially since I can't seem to repeat it.

Help!