Seems early for me too. The part that confuses me is my key set the alrm off and the killed the engine (after starting without hesitation) but my wifes key worked fine. Even after I drove the car after the first instance, I returned home and just for grins and giggles, took my wifes key out and inserted mine.
Car started, all needles pegged, engine shut down, alarm sounded....
It ran great for a week then my wifes key did the same thing.
dealership said the only they could find was a dead battery...
I'm thinking intermittent short in the security system computer, or (a stretch) a loose cell or plate in the battery.
A dead battery will cause all kinds of goofy things to happen!