I ripped two CDs yesterday and it had no errors at all, today I ripped them again and suddenly some tracks show errors. On one CD it's only the last track, on the second CD 15 out of the 30 tracks on it show errors. I re-ripped some other CDs I already ripped to see if the problem of the errors was because my PC or disk drive, but that wasn't the problem. Is its because I always clean my CDs with a cloth before putting them in the drive? It seems really weird to me that CDs somehow get damaged overnight although I take good care of them.