1994 Nissan 300ZX Complete car shutdown.

I have a 1993 300zx that I was driving and hit a pothole that caused my entire car to die. No lights, no dash lights, no hazards and no engine. A cop offered to push me off the roadway with his cruiser and when he bumped my car everything came back on and the car started fine. As I drove it home I noticed it cutting out and coming back on as I was driving it and hitting bumps. I have checked all the battery and alt connections and they are all fine. I also checked all control modules and they're good as well. What could be causing a complete car shutdown