After getting hit by a car, whethe it be full speed from a truck or a small love tap by a supercar, your car has a chance to shutoff randomly. This occurs when ur damage is in the 90% range or so, but thats not the issue. The real issue is that sometimes, after crashing into a wall and having 2% damage, the car takes 5-10 seconds to turn on again. This happens in Sumo and Gamemodes from what I have heard, its hella annoying. If this is intentional then mb.
Does this occur when rolling, or when stationary? If rolling, then its a rockstar thing, nothing can be done about it. The car is accidentally still in reverse gear while rolling forward and it stalled. All you can do in this situation is come to a stop asap, so the car will put itself back to first gear. If this happens when standing still, then no idea.
This happens due to game engine features, I don’t think it’s possible to change this.