Phone Mic Goes Out

[tkjames]

So over the past couple of days, the mic on my phone has been going dead in the middle of a conversation. I assume it's the mic because I can still hear the person on the line quite clearly. One person told me that she could tell when the mic went out because it went completely silent; even the background noise was gone. I basically have to end the call, then call the person back.

I can't think of anything I've downloaded or done to the phone recently. Has anyone else had this problem and found a fix, or will I be battling with Sprint to get a replacement phone?