I think you are using pirated copies of Fifa 08 aren't you Isadinho? That would explain the 'hanging' and the random freezing. As you said it can't be all 3 of you and your friends console's having the same problem, so it must be the copies of the game. If you are indeed using any pirated and/or illegal form of Fifa 08, then we definitely cannot help you! We have a strict anti-piracy policy here at Absolute PlayStation.
And i am again not able to answer your question as downloading PS2 games from an illegal source is indeed Piracy. It's illegal and unfair to the publishers and the developers of the game Isadinho, please do not ask us for help with any such matter.