The game just randomly crashes once in a while. The first time was when I beat the air robot (well, the robot in the second reactor) then it happened when the Zolom used beta for the first time, and the last time it happened is at Junon, for the first time. After saving that little gir and the old woman let you rest in her house, Cloud hear a voice that speak about Tifa. When should wake up and Tifa should be standing by the bed, it crashed.
1 other bug, when I was trying to get Yuffie. I was fighting her near the mythril cave. When she was running away, the ame wuldnt crash yet, but when I would open the menu, the EXP/AP menu would appear behind it and the game would freeze. When I would get an other fight, the screen would become dark, the fight would never start. Same thing if I was changing area.