Infamous 2 sound.........?

i played through infamous 2 on bad karma and didnt have a problem with the sound until the very end of the game. the sound would start to cut in and out every now and then which was no big deal. i am now going through the game on good karma and now the sound problem is happening way more often and its starting to cut out the voices on the missions. is there anything i can do besides restarting my ps3 because ive already tried that.