My first guess is that your DVD is screwed. Is there any damage to it? Dust or filth? My X disc had a hair scratch on it that prevented me from getting past the video of Yuna performing the sending in the second town. (Not my first time through, mind you.) I had to Disc Dr it time and time again before it would get past that point (scipping and glitching), then it got stuck shortly after in the video where they first arrive at Luca. If the disc is in good condition, the laser might need cleaning. As far as I know, there's no bug or glitch that causes the game to freeze.