Dash Trim Repeatedly Coming Loose

I've had our 2004 530i into the dealership 3 times to fix the long dash trim. It keeps coming loose at the end near the steering column. Each time they replace the clips, it seems to hold for a couple of weeks then breaks loose again. Has anybody else experienced this problem? Is it possible that the trim piece is warped and causing to much stress on the plastic clips??

I've had 2 e60's - had this same issue occur on both of them, albeit only once on each car. I bought clips and fixed it myself both times, took 10 minutes. I keep a few spare clips on hand now too.