Burning question

i have been using clonedvd2 for a while with no problems but now when i copy my movies the copy plays almost til the end then just pauses and never plays through. i have tried different disks,r,rw and different brands but keep getting same problem. can someone please help

try taiyo yudens, verbatim, sony (made in japan) media.
update your firmware for your burner.
and lower the burn speed.