IPhone 4s won't record sound with video?

My iPhone 4s suddenly won't record sound when I record a video. It is usually a static sound or sometimes it is the sound, but extremely quiet. Also, when I try to FaceTime, I can hear the other person but they can't hear me. Any ideas on what I can do to fix this?

Sorry but you might have to send it to apple for repair. The sound wires might be messed up.

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