I have an ipad4 with retina display and until 2 hours ago it was working fine. It now only plays sounds / audio through only 1 jack on the earphones. I checked the earphones in my phone and they work. I checked the iPad with sons earphones and same problem. Therefore it's the iPad not the earphones. I went into settings/ general/access ability/ hearing. The slider setting is at midway point. Anyone have any constructive ideas?