Be sure that you have the machine set to beep when you move the fabric too fast. Then if it is not beeping, you are not moving it too fast for the BSR. If that is the case, I would take it back to the dealer, show them examples of the problem, and tell them to either fix it or give you a new BSR, if it is still under warranty. I can't imagine my dealer giving up on a problem like that, and yours shouldn't either. Good luck.