twice in the last 2 weeks on my 93 750il after i turned the car off, key removed, and headlight switch off. the headlights remained on. neither time was i able to diagnose or investigate the situation. but one time when i put the key in and turned it foward and back they went off and the next time i moved the signal switch to bright and they went off. anyone had this happen or is this just another grimlin in the making?