Hi, I have this exact same problem every once in a while with my 2013 HP Envy 15 with Beats Audio. I've found that restarting my computer solves the problem, and literally nothing else does - leading me to believe it is in fact a software issue. That's about all the advise I have - as for why it occurs, I've yet to recreate the problem under any of the circumstances in which it has arisen. It comes and goes.
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