When the S6 came out I had this happen, I sent it to samsung and they fixed it free of charge. They seemed they were quick to get it and fix it to so I didnt complain. they replaced a couple other things to I just dont remember what. Come Note 5 It started doing this a year after Ive had it and it does it every once in awhile. but it doesnt seem to do anything it just sounds like an electric shock so I will not be sending this in as I will upgrade soon. Im just glad I didnt get the Note 7 and delt with that mess