I just got my XD9 sc. Anyways, After the mags have been loaded and carried awhile it sounds like one of the bullets starts rattling aournd in there. Usually the problem is solved by removing the mag (if its in gun) and banging the back of it against my hand a few times. Is this normal? I know its not a huge problem just a minor pain in the @$$. Any permanent fixes? Will it go away as the springs break in?