My Psx is too old?

[thesabin]

I have an psx(scph-5501) with an old modchip(unknow) and it still working. But when I put a backup CD in it, movies and music is skiping. The psx have difficulties to load datas somtimes. But I read a guide (how to burn psx games with Nero 5), I did everything and still skiping. (I made a backup from originals Cds). I burnt at 4X( the lower i can do) and i know the best is 1x but i must burn at 4x. I lost a lot of virgin Cds with this problem. It makes me realy sick and im tired. Should I buy a moded PsOne(the small one) or its ''Normal'' what happens.