I just bought a new FiiO E10 about a month ago, and paired it with my Shure SRH940s which I bought a couple months ago. The amp sounds amazing except that I think it may be causing some sibilance. If I leave it plugged into my laptop for about 15-20 minutes without playing anything, I hear sibilance in all my songs. Only when I re-plug it does the sibilance go away. Does anyone have any ideas as to why this happens? Thanks guys.