I bought galaxy s3 1 month ago and i found this problem. With both stock 4.1.2 XELLA and 4.1.2 EMC2 and original samsung headphones, sometimes,randomly, button on the headphone dont respond to press. After 1 plug-out,plug-in or a restart they come back to normal. The mic still work even when the buttons are unresponsive and buttons response only response to long press(ex:answer key start google now after long press, but dont pause music).I tried a different headphones from another galaxy s3 and same problem. I made a hard reset nothing changed. Anyone had this problem? For me is very annoying, and i cant find a solution