On Christmas Eve, I stopped at the grocery store to get some supplies before going home. After I returned to my Beetle, I started it, only to have it die after a few seconds. I was puzzled but turned the key again. Same thing. And then the same thing again. Finally, on the fourth try, my car started up and stayed running, but I noticed the odometer had suddenly reset itself to zero and the check engine light and the airbag light had come on. They haven't shut off since then. What's going on here? Would I be right in guessing that it is something electronic?