I just got a cd off of ebay, and have noticed that there is one spot on it that it skips on my cambridge 640 c, but it doesn't on my dvd player and didn't when I loaded it on my itunes. Is there a reason for this, and also, is there anything to do about the skipping? Looking at the cd, it looks like there is a small spot where a layer of the disc is missing. Thanks for any tips.