Car shifted erratically and shut down multiple times while at speeds up to 45 mph with loss of power assist for brakes and steering, the last time while rounding a curve and braking for a stop sign. when restarted, the indicator for the shift position was completely blank (reappeared on a second shutdown/restart. dealer finally located a trouble code (no check engine light) which indicated a failing transmission oil temperature/shift position sensor located on the automatic transmission. dealer refused to submit to hyundai in spite of the fact car was still under drive train warranty and safety considerations of such a failure. this obviously covers up such failures from nhtsa oversight. problem has not reoccurred since sensor was replaced. repair invoice from the dealer is available upon request.