This is now my second iphone 5s replacement and it still has the same issue, when I sake the phone lightly up and down I can hear it rattle, it sounds like something is loose inside, the sound is comparable to a loose screw floating inside. I know that the power botton on these phones are loose and can cause a rattle however when I hold the power botton down I can still hear the rattle, it's coming from the back near the camera and as well as the bottom of the phone where the speakers are, has anyone else had this issue? is this normal or are they all like that? I just to don't want to go back and get another replacement if it's going to have the same issue again.