Range Rover Vogue Engine Problems

If this was just a case of the engine not starting every now and then, I’d be inclined to look at the starter motor and, in particular, its solenoid. But since the starter-stop button also sometimes refuses to switch the engine off, it sounds very much like the button itself is faulty.

You can remove the button and clean the electrical contacts with a cleaning spray, or simply swap the switch for one you know works perfectly.