Maybe a long shot.., but I had something similar a couple of years ago, and only happened several times. Twice pulling out of same store lot, stumbled, lost power, but regained from vehicle jerking around a bit from the two uneven surfaces meeting under my vehicle. Other times in a store lot, would not start.
Thought it was my starter. Lightly tapped it with a maul handle club, and fired up. Happened again, but don't like wacking my starters. Don't remember how it occurred to me, but I slid under vehicle, and eyeballed, and wiggled wires, and realized my little green wire was loose. Bad weather 'twas, so I just wedged a little stone in there, lol, and it's been that way now for all of these years, and have never had an issue again. If it does, I might get a real tool, and tighten it up.., or just find another little pebble of a rock.
Might not be your problem though... Somebody around here should come up with an accurate diagnosis for you, but that's the best I can do at the moment.
