I just installed the xb led headlights from the retrofit source. The left headlight vibrates with road bumps. Its noticeable by cars in front of me---my son pointed it out to me when I was following him. So I informed the retrofit source and they quickly sent a replacement - great service! However this one is doing the same thing! Seems the projector(s) are loose in the headlight, I think. But anyway, has anyone experienced anything like this? I'm going to contact the retrofit source again, but .... By the way, the right side is rock solid.