2008 Toyota Prius wipers, windshield & visibility problems

We have 2008 prius that first began having left headlamp go out when driving, we would have to pull over safe place along road turn mess with turning headlights on and off... Created unsafe driving remainder of trip, aprox 200 miles night drive to get home with one headlight... Not good on montana roads with wildlife prevalent on roadway... Dealer replaced under warranty... Two weeks later same trouble with right headlight while driving home at night from spokane wa.

While driving at any speed, the hid headlights intermittently cut off. This usually happens one at a time, and mostly on the passengers side. I am unable to tell when they go off until either I get pulled over and warned which has happened once already or I pull up and see reflection off back of another car. The lights will work for short periods then off again then on again.