well.. try backspinning them not so hard, and see how it works out. If you spin them to hard, your causing the memory to read only the amount it took in. So if you backspin over that amount it would stall cause it didn't read over the amount you pulled back too. A backspin sounds just as good when you do a nice easy pull back.. then a fierce backspin. It would be like backspinning on a turntable to hard, it would cause the needle to jump cause you used to much power.