Hi! I have got the same problem with my Xperia (5.0.2). In addition to the aforesaid, the problem arises after you listening the music first (sound volume and sound quality - ok), then talking or playing by phone and after that I am trying to listen music again - the sound in hearphones becomes awful. Sound volume may be very loud and the same time, sound quality (bass, treble) becomes different settings and it is impossible to listen to music with such awful quality. Only phone restarting helps to return settings back (equalizer settings and type of earphones). I chose type of earphones proceeding from impedance parameters (Hifiman earphones). Please help. Cheers!
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