CD player reads only part of the files (songs)

CDs I burn using Windows Media Player 9 read and play fine on the PC, but when I try to play them in my DVD/CD player, the player reads fewer songs than are on the CD. For example, I burn 200 songs (WMA format...Microsoft) onto the CD. I can open the CD and see all 200 files and play them on the PC. Then, I put the CD in my Panasonic DVD/CD player that plays both MP3 and WMA files and it "sees" only 41 songs.
Those 41 songs play fine.

I thought the problem was with the player so returned it and bought another model. It, too, read only 41 of the 200 tracks. I have burned a couple other Playlists having over 200 tracks and they were read correctly. But, other playlists read fewer files than are really on the CD.

Using 700 mb CDs, recording as "DATA CD" (HighMAT), speed 2x, TDK brand CDs (my CD burning in my laptop is a TDK). I have used 2 other brands of CD (Memorex and Phillips) with the exact same results.

Got me stumped. Can any of you suggest why the external CD player isn't reading all the songs?

Thanks,

Shocklin