we have dvd digital home theatre system th-a5(xv-tha5 & sp-tha5) weve had it for approx 1 yr. the dvd player will not play certain brand new discs. when it does play it constantly stutters- or just stops playing. we have tried cleaning it- stopping and restarting, ffwarding nothing works. we dont know what is wrong with it. some discs work fine. others dont. please help!

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