Ok so went to dinner tonight and while i was parking the car dinged 3 or 4 times i dont remember how many times, but once i finished parking and turned the car off not even a second later the car died everything turned off and reset. Normally the radio stays on and then it all goes off when the door opens. NOPE just died

Any idea or reason why this would happen?? I thought it might be the battery so i went up to autozone and they checked it, they said it was healthy with a 84% charge.