I'm not saying this will work for you, but I had the exact same problem. I found a perfect, easy fix for this AND it's a tension-release at the same time. Here's what I did: I took my 5s and SLAMMED IT agains the wall as hard as I could. Then I jumped up and down on it repeatedly while cursing. Not sure if it was the slamming, jumping on or cursing that worked, but now it works great! It even talks to me and keeps me company when I get lonesome. Another phine product phrum the lovely people at Apple.