CD player skipping tracks

Just curious if anyone else out there has the problem of the CD player skipping tracks on commercially made CD's.
I listen to audio books as well as commercial music CD's, (not copies or ones that I have burned) and on some CD's it just refuses to play some tracks, while on others it will play part of a track then jump to the next one, and if I replay the track it may play all the way or skip at a different spot.
This happens even with the car parked and engine off so I know it is not a vibration problem. It has done it on brand new straight out of the box CD's. It does not do it on every CD, but about 75% of them.
The dealer tried some of my CD's in another Smart fortwo and it did the exact same thing, yet when they played it in the mechanic's boom box it played fine.
They didn't have a solution but said they would report it back. This was a few months ago, and was the last I heard about it.
Also, does anyone know if the CD-player has a buffer built in? I have an old portable player that would buffer three seconds of sound to allow it to get back on track if it got bumped.
Except for this one issue, my car is great!