When driving around, I have noticed in my rear view mirror the LED lights on some Mercedes shake up and down. They are both connected and it seems that something broke loose and is now letting the bar bounce. Has anyone else seen this? I have seen it on 5 cars so far. Kind of sad for an expensive car to have something simple like that to break... So if you have a Mercedes or know something, maybe tell them to inspect the lights to see if it is broken because it could be a pain to fix out of warranty. You wouldn't be able to tell if it was happening unless you had someone in front of you checking them on the road. I.e. when you bring your car in for service, a technician wouldn't be able to see what happens to the car while it is on the road. Here is a picture of the lights I am referring to.
I think it's just the angle of the light you are noticing. I've noticed that with HIDs and LED driving lights lately.