Just found this same issue on my wifes 2014. We only have around 22k miles on it and it's parked outside 24/7, doesn't fit in the garage due to length. I just noticed today her passenger side upper lens has numerous cracks and the lower lens has several cracks. There are no impact marks, no marks on the chrome trim around the lens and no marks on the bumper, so everything that sticks out in front of the lens has no damage and the lens has no impact marks. Has to be bad materials. We are due for an oil change and will be headed to the dealership