Not sure if this is the same problem. Not my X5(it's on the way), but my VW. I run LED lights for the rear license plate. When they start to go bad, you will notice a lot of flicker. It has something to do with the regulation of the LED's. I have went through 5 sets from diffrent locations, before I have a set that lasts and does not flicker.
The ones levi sell look like my last set that are working well. I will try his out when my x5 gets here. Got his halos LED's in route.