Hello my name is Mirko and I wonder if anyone knows why because sometimes the burned movies on BD-R DL media block to about half of the film. Precise that before I burn the 1: 1 copy of the film and then the .iso image. After burning, about one time in four, the copy being played just hangs! It could be a burner problem? But many discs are well mastered and then? Because sometimes happens? Using programs like Nero 2016, Alcohol 120%, Ashampoo 2016, etc., but always the same. Thank you for your kind help.