iPhone 5s call echos and then drops
So just in the past couple of days I have noticed that my 5s has been dropping calls pretty consistently. If I recieve or make a call it will start to echo a couple minutes into the call and then it will drop after about 30 seconds of echos and silence. When I call back after the initial dropped call there is no problem and the call works normally. Could this be a bug in iOS 7.1? Thanks.
iPhone 5s, iOS 7.1