This is normal on dual-layered DVDs. Most commercial DVDs are dual-layered. The pause occurs as the laser changes angle to read the second layer. If a DVD properly mastered you won’t notice the pause, but sometimes it’s difficult to avoid. This is normal and the way dual-layer DVDs are designed, meaning nothing is wrong with the DVD itself. However, if the movie is pausing or freezing throughout the film, the DVD disc itself may be damaged.
DVD Movie ‘Freezes’ momentarily Half Way Through