I bought an SP LITE in February, but since the snow just came off the courts I haven't been able to use it until today. I immediately noticed that there was a problem with the "Spin" feature of this machine. It will do Back Spin just fine, but when I put it to the Top Spin setting (full level) it doesn't add any topspin. In fact, the ball still has a little backspin on it. SP is closed today, so I thought I'd post to see if anyone else has had this issue? If so, what was the ultimate fix? Thanks!