Why does the N4's camera freeze up once in a while? Sometimes I take it out and just want to take a simple pic, but it doesn't want to take a shot. I have to hard boot the phone in order for the camera to work. Last night I used my N4 to take pics at night. Instead of taking a picture the camera flash turned on and stayed on until i went to the home screen. At that point the flash turned off, but it still wouldn't take a picture.