Headlight problems

I own a 2002 Chevy 2500HD with 50,000 miles on it. Recently (two days ago) my headlights went out while on high beam. A few seconds later and they came back on. I finnally figured out it only does it on high and only while the steering wheel is turned or being tilted. Any help will be greatly appreciated. I have had no other eletrical problems to date.