Headlights problems of the 1996 Mercedes Benz 300

Driving at 70 mph on cruise control and electronics on front dash went blank, car decelerated, and I had to get off the road before it stopped. Car would not start for approximately 30 minutes. Was able to restart and drive to safety. Drove car home after a few days - in area away from home and had to use rental. On return home with vehicle, it again stalled out while driving at 40mph on a drawbridge at night! again, car was able to eventually get restarted and driven to safety. I have had car at mercedes dealership and two other car repair centers that were endorsed. No one can fix the defect. I have spent over $12,000 over less than 2 years to no avail. We just continue to get milked for money. The car does have 156k mileage on it, but is a diesel and has been well cared for despite the mileage with maintenance checks as warranted by the dealer.

Headlight bulbs continue to fail.