dunno! - what software you burnin them with? I use Nero...have done for years and it never fails. Have you tried a different brand of CDR...some players dont like certain brands, athough that is more a problem of yesteryear with old players, new ones should give you no hassle at all. Are they massive files (ie long tracks at a very high bitrate? You could try re-ripping the songs using a lower bitrate to bring the file size down a little?
All just ideas and to be honest quite long shots?
Yo not got 6FL carlos?? I rarely play CD's in mine so have had no trouble so far.