DVDFab Express Fails at half of movie

I am using Express Usually it produces a backup that will only play half of the movie.

I write with a Benq DW 1640, and have oodles of memory. Again, if I use DVD Decrypter + Dvd Shrink it will usually play all the way. Also, if I use DVDFab Decrypter + DVD Shrink it will usually work. This occurs with both Arcos and non Arcos movies.

Any help will be appreciated.