Problems while burning a backup

[soujir0u]

Here is my problem , i have been making copies of cd backups from ps2 games normally with CloneCD until yesterday when i got 3 new games [shinobi,robotech,guilty gear xx] that when i try to copy they just stop in 67% of the image and start getting errors while reading. These games work just fine in the ps2 and i have been trying with different setting of the CloneCd without much luck. I also try in a machine with a different burner with the exact same results.
Does anybody have any clue of why does this happend ?