Headlights Turn Off While Driving problems of the 2011 Toyota Prius

The contact owns a 2011 Toyota Prius. While driving various speeds at night, the front driver side headlight became inoperable. On another occasion, the front passenger side headlight also failed without warning. The dealer recommended that both bulbs be replaced. The vehicle was repaired; however, the failure recurred two years later where both headlights failed. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was unknown.