Clones of Laserlok CDs getting "worse" over time?

[cdkashgar]

Two years ago, when I had first bought my CDRW (LG GCE8160B), I had made Clone CD (v3) images of some Laserlok protected CDs (Persian data CDs). At that time, the copies were perfectly running. Now, when I try to run the programs, the Laserlock protection refuses the cloned CDs. I tried to make images of the clones, or apply generic Laserlock patches, but then, unfortunately, I cannot read some data files needed for the programs: they are corrupted! So, the clones are useless now. And at the time of dumping from the originals, I did not keep the image files.

My question is, how is it possible for a cloned CD to work initially, and then, stop working later? Could it be due to the bad quality of the CDR media?

Thanks for the replies