Recently my phone has stopped responding to the play/pause and skip function on the iphone headphones. The mic also doesnt work. I thought it was the headphones at first so i went and got them replaced at the apple store. with the new headphones i tried it again and they still didn't work. I restored the phone and they still dont work. What do you think is wrong. Is it something to do with hardware in the phone? And if so would it be covered in the apple care warranty? Thanks