Why does my pinstripe keep coming off my car?

I just purchased a 2011 Acura TSX. Every time I go through the car wash, my pinstripe comes off. I go through the touchless car wash and I have used it many times with my old car and had no problems. I just took my car back to the dealership for the 3rd time to have the pinstripe fixed. I have a feeling this will happen again as soon as I wash it. I have waited at least a week each time before washing. We have had a lot of snow/rain lately, that's why I have been washing it. I want to know why this is happening.