Hello, I have a 64GB 4S. I'm using about 40GB of the phones memory with photos and music. The camera and photo roll is constantly freezing. When i take a pic and go to the camera roll it freezes for 5 to 15 seconds. Or when i do a screen shot, the camera roll freezes. Apple sent me a replacement phone and i get the same thing. I did restore and even setup the phone as new (not restore from backup). It seems to me that once the memory starts to fill up past 1/2 way this happens more and more. Any Help is appreciated.