Lights going out on the car - this one might out-fox even the foxiest of you out there....!?

I have something so weird going on, that I would gladly pay money to find out the reasoning behind it - if only I knew who to ask! At a certain point on a country road near my village, the lights on my car suddenly switch themselves off at night. Not always, but every few weeks whilst travelling down that road I will suddenly be plunged into darkness. It always happens on the same stretch of road (within about a half mile range) and turning the lights off and back on again always does the trick. This is pretty much in the middle of nowhere (Northampton to West Haddon road if anyone knows it!) and I can't think of an explanation for it. Has anyone got ANY ideas at all? BTW, it has only happened with one car in our house, our other car has never suffered this problem, but given that it has never occurred on any other stretch of road, it's got to be more than 'just' the car's electrics? Any ideas much appreciated.....