So. I have a major problem that kinda affects the gameplay pretty much.

Every time i get into water and the camera angle starts to get under water the game freezes and I have to start the PS3 all over again. This happens anyway on the map, as along as there is deep water there where you'll have to swim. At some quests you are kinda required to swim and it's pretty annoying then they can't be done.

Is there any way this can be fixed?

I hate to be a "that guy" but, do a search for "water glitch".This is an old issue with an easy fix that I won't go into and do the work for you.

The info is here: http://www.gamesas.com/topic/1364560-game-freeze-after-going-underwater/

Then don't be "that guy." The link is easy to copy/paste.

Yeah, I know. I just was just being a little lazy and wasn't in the mood to look it up and do the OP's work for him.