This just started.... For some reason, my headlights don't go off when it gets light. I leave for work just as the sun comes up, so it's still dark enough to make the headlights come on. By the time I get to work the sun is up, but my lights are still on, eventhough the switch is in the "auto" position. Sometimes they will go off, but more often, they stay on. The windshield is clean. Can anyone tell me where to begin to diagnose this annoyance? Is there any chance MB would stand behind this at 53,000 miles?