hey i have a 2008 grand prix and the other night i left my car funning while i got the mail and while i was getting back into my car the auto headlights turned off and wouldnt come back on unless i did it manually. not a big deal at the time bu tnow even with key off and out of ignion theyh stay on. so i have disconect battery or pull battery fuses, huge hassle. any ideas to whats going on?