I have a 911 Porsche carrera cabriolet . Since 10 years I have had a problem with the right headlight. The Porsche mechanic has not been able to fix it. Both headlights come on when switched on. Within 10 minutes the right headlight goes off. If the car is stopped and started again the lights come on and again within 10 minutes the right one goes off. Now I have been using the car sparingly only during the daytime. High beams work work normally.