Help with a clone dvd 2 prob

hi there everone,
i have owened clone dvd2 for some time now and burnt ova 200+ movies when suddenly now when i try to burn with it, instead off taking 30-40min @2.4x its taking 1hr20min cause now when its gets to 100% it just sits there t6aking for eva to flushing buffers ,writing borders and after an hr +it says complete but it wont play anywhere and its costing me alot in wrecked disks so any help to fix the problem would b greatly appricated thnx.