I had the strangest thing happen, I was driving back on about a 5 hour trip on Sunday night..I heard a "ding" and then my driving lights went out completely. I pulled on the "brights" and they would flash but not stay on. I pulled over turned the vehicle off and started again then they came back on. I think this is the second time this has happened but it was dusk the last time...any ideas on what is causing this?