Suddenly I can't charge it. Charging response is poor."
"My voice doesn't reach the other person when I'm on a call."
"The message 'This accessory cannot be used' appears (even when using a genuine Apple cable)."
"When I press the volume button up or down, the volume gauge doesn't appear and no sound comes out with certain actions."
Problems with charging or malfunctions of the call microphone will require dock connector repair.