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Howdy everyone, don't know if y'all have noticed about this, but i got a problem where my Xperia Z3 D6653, after got it's OS update to Lolipop 5.0, when i am listening to music via the default music player on my phone by headset, the headset setting and the equalizer setting aren't working as usual
The problem is, when i plugged in my headset which is a SONY MH750, then i play the music, the setting which i had set before on the equalizer and headset accessories setting are always revert to general, even though i re-set them, for example i set the equalizer to treble booster and the headset acc to MH750, the sound works great on that song that were played at the moment, but once the song's end and move to other song, the setting will always back to default again which i have to re-set them
well, re-set them everytime we play a single song is not really a good idea, do we really have to do that everytime we listen to the music ?
i though that the update for lolipop 5.1 which i had patched them recently will fix that issue, but i tried this morning and it hasn't been fixed at all
so i was really hoping that SONY would consider to fix them on the next upcoming update
maybe some people will thing that is not an important issue, but for people like me who loves to listen to music, it's really irritate me....
no sir, my phone didn't use any single extra apps, which is why i am confused 
Few things I would check are
test other headphones
or
reinstall the latest update with PCC and report back
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
@ Phy
thx sir for your solutions, though i tried them just now and its still haven't fix the issues, but appreciate for your concerns 
@ uliwooly
what do you mean by report back sir?
Repair the phone with PCC > report back as, let us know if you still experience the same issue.