I have had electrical diagnostic performed at 2 auto service shops. No one can reproduce problem. I leave for work and no lights are on. I park my car at work for 8 hours. When I leave to come home, parking lights are on. This has happened twice. Another time, was visiting a friend and when I came home; the headlights were on and battery dead. This is when I had electrical diagnostic at the Buick dealership, still could not recreate problem and tell me what is wrong.