This belongs in the PSOne & Playstaion 2 FAQ forum, but anyway, the reason could be that your CD lens has been worn out because of constant gaming, it's not your fault. What you should do is send your Playstation 2 back to Sony. If they can't fix it, they will send you a new one at no cost, provided of-course that you did not put in a mod-chip or some other kind of modification in your system.
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