99 SLK 230. Going down freeway at 60 mph when it just died. Pulled to shoulder and tried to restart but nothing, would not even crank. All lights, radio, gauges, windows worked so it was good electrically. Towed home by AAA. Back at home it started right up (???). It was not a fuel issue, and obviously it wasn’t a blown fuse. I’m stumped and not sure it won’t happen again. All opinions welcome and appreciated.