I had ripped other records, they extracted fine. But there was one CD, where the ripping was desperately slow and the peak level of what I got was always 0%. Sometimes I got “Sync Errors”. I tried several times without success. What can I do then?

Have a look on the CD if it is dirty. Try to clean it (from the inner ring to the outer bound), perhaps it works better then. If not, try to lower speed or even to extract in burst mode, sometimes this will give better results (but no error reporting though).