Why did my Nissan Patrol shut off when going over a dune?

[lukeloather]

When driving over a big sand dune the car stopped and didnt start back for atleast 20 min.

this happened only once and i am worried that it may happen again.

How can i stop this from repeating

[nikniss]

Car when overheats to an extent it cut off automatically and start back after it cools down a bit.

If it was not due to overheating, you could suspect on fuel filter or fuel pump that might have given up on that specific instance.