[dancing spawn of ungoliant]

I bought my copy of EE (dvd) and everything seemed fine. Then I noticed that the dvd "jumps" or makes a little pause always in three different parts. I know it's not my dvd player that makes the pauses but the dvd (I have tried four different copies of TTT EE). So I'm wondering if your discs does this thing too. Or perhaps it deals just with those dvd's in Northern Countries. The first pause appears in the very end of the first disk after Faramir has said: "Bind their hands." The second pause is on the disc two in the "Glittering Caves" scene when they show how the men are taken away from their children and wives. The third pause is on the very beginning of the third disc after one has chosen the languange. Answers appreciated!