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On my 5s, when listening to a voice mail, or talking on a call with someone in a room with some noise, or in the car, I get a really strange echo, like the ambient audio around the room is being sent in through my ear. It actually is jarring and makes it difficult to follow conversations. Anyone else hearing this? Want to determine if it's a systemic hardware issue or just perhaps my phone. iOS 7.0.2, and using the Apple branded leather case.