Hey,
5 months ago I got my FiiO E10k amp/dac, for some reason sometimes when I turned my computer on, no audio would be outputted from the headphone jack. I would have to shut down my computer and turn it back on, restarting wouldn't make it work. Then it could work, sometimes I had to do it again. Now I've upgraded to Windows 10 and it won't output sound even after many restarts.