Cna't back-up Narc

I’ve been making DVD back-ups for awhile now (with both anydvd and clone dvd) But I can’t seem to be able to copy my copy of Narc, It stops at about I think 15% (but I have also lately been having problems with a few discs copying all the way threw but then the copy either doesn’t work or the copy will play on my home dvd player but not the drive that I copied it with, not showed up.) I’m confused, please help!.