As a follow-up from my previous post, the dealership has had my Tahoe for over a week again this time. The problem has been previously twice, the first fix was by removing the shims and I’m not sure what they did the second time. Of course, which neither fix worked. They now have replaced the spoiler and its back at the body shop to have it painted and the roof line repainted from where the spoiler chipped the paint off. The body shop owner told me that he told the dealership the last time he had it exactly what the problem was and why it was sticking. He stated that he told them that the plastic trim piece was mounted about a 1/4" to far and when he got the new spoiler that piece was mounted correctly. I guess when I finally get it back, we will see if this fixes the problem.