Movie stuuters throughout and freezes 15mins from end

i am new to copying dvds...but i decrypt my dvd and then size it and write it using recordnowmax,but when i watch my new copy on my player or a neighbours player the film start to freeze ,can anyone help me pls to overcome this problem,ive tried 2 different types of dvd+r discs
i have a hp dvd2000i writer

1x Media will cause less playback problems than 2.4x or 4x. Try a DVDRW as well. Keep trying different media and also try Nero rather than RNM until you find a solution that works for you.