volume key of mipad doesn't work after i use this device for a day...I need to switch off the device and again it works for a day and then again i get the same issue. The volume becomes loud and uncontrollable via the volume buttoms.I thought it was due to earphone but this issue is still there when I disconnect the earphone. I have only used this device for less than a month and its irritating me. can anyone suggest me a solution?