Who ever is making your yokes is not anchoring them. You either broke a few strands on the yoke or a few have broke lose. If you have the equipment. Mark your cam, put the bow in a press, remove the yoke and reanchor it or make a new string. If you do not have the equipment to make one yourself, take it to a proshop for them to press it and rebuild the yoke or a new string, relative to the problem. Its a pretty easy fix.