One problem related to engine shut off without warning has been reported for the 2007 Mini Cooper S. The most recently reported issues are listed below.
Daughter was driving the vehicle and while stopped at a toll booth on the NJ toll road, the car shut down and could not be restarted. After several mechanics, the 3rd mechanic has diagnosed the problem as " locked up vacuum pump on engine that caused camshaft sprocket to snap causing bent valves in engine,motor oil was full . " totally unsat.