Iphone 5S Power Button Loose

So, I went to have my 5S replaced at Verizon and the replacement phone has the same issue. Then I went to another Verizon location and the phones there had the same issue. Even the display phones power buttons rattled. So, how widespread is this issue? I made a video to illustrate how it affects video recording. The button is proximal to the rear microphone. http://www.youtube.com/watch?v=ZaGx1DBar7g