I had this problem but it was definitely a software issue. I never use headphones. It only appears if i turn off and on the phone too many times within a short period of time (few minutes). You can get rid of it by poking a headphone around in it until it disappears or turning off the phone and letting it sit for about 5 minutes and turning it back on. Its a recurring problem that ive dealt with with those 2 methods many many times
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