After driving about 25 minutes, at the stop light, the car just shut down. All icons lite up on dash. After panic and three tries, it turned over and I drove away. Went to AutoZone. Guy checked and said battery fully charged and fine, alternator fine. Stuck a gadget in driving column and test showed nothing wrong. I asked what could have been problem..he had no answer. I’m afraid of getting stuck somewhere, but more afraid of dealership. Please guide me. What should I do next. Made it home, no issues. 2005, 52,400 miles