Car randomly shut off

What is your question?

I was reversing out of a parking spot and my car shut off completely, after a few tries of trying to restart it, it started running again. I went to back out of the spot again and it shut off completely, I mean none of the electrical would come on, no fan, no radio, no lights, then after a couple minutes of waiting with the key in the ACC position everything turned on again (the clock was reset). and I was able to start the car. It hadn’t happened since but it’s only been a day, I’m trying to figure out what caused this so It can be fixed and not completely shut off in the middle of traffic. Thank you.