At the beginning of each CD is a TOC or Table Of Contents. If this is damaged, the player will not know where to find and index the beginning and end of each song selection. CDs are susceptible of manufacturing defects as well. Examine the disc for surface abrasions. The aluminum that is vapor depositioned to the polycarbonate may also have a flaw in it, but that really was an early days QC problem. Hold the CD up to a bright lite and see if there are pin holes thru the read layer at the center. Does the CD play in your computer?
Wayner