Having trouble with my low beams when the outside temp gets around 40.They (not sure if its one side or both) flicker, sometimes when Im at a stoplight the lights turn off and quickly back on when Im behind a white car or a vehicle with a chrome bumper. Other times I could be alone on the roadand they flicker over bumps and when braking for a stop sign or accelerate from it. Last winter had it at the dealer several times and they cant find anything wrong - just tightened a ground lug. I had no trouble from April till this first cold 40 degree weekend. Also, I have recently noticed that sometimes the "city" lights work only on one side or the other. Anyone have any ideas?