The day I picked up my new cabriolet, I noticed a flapping noise at the upper rear corner on the passenger side of the vehicle at highway speeds. I have brought the vehicle back to the the place of purchase. They have attempted twice to correct the problem by tightening the "tension strings" but to no success. I still have the same noise, a little less at best. I am waiting for the dealer to call me back when they have a loaner vehicle so that I may bring it back to them to see if they are able to finally correct the situation. Has anyone had a similar problem?