music system not repair in just 4 yrs of purchase

DEAR SIR,
I AM YOUR VERY OLD CUSTOMER.I HAD PURCHASED TV,CAMERA,DVD,MUSIC SYSTEM & LAPTOP OF SONY BRAND BECAUSE I HAVE STRONG FAITH ON SONY.BUT I AM FACING PROBLEM IN MY MUSIC SYSTEM MODEL(DHC-GNZ7D) FROM STARTING.2 TIMES YOUR EXECUTIVE HAD CHANGED THE PARTS OF MY MUSIC SYSTEM BUT WITHIN 6 MONTHS SAME PROBLEM OCCURED.
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