Xperia mobile's volume is lower than usual

This just happened days after starting to use the phone, in first instance it was loud and great but now it has lowered (speakers, earphones and bluetooth audio devices).
I even used to get the high volume warning but now I don't.

Does somebody know what could be causing this situation?

from Android Forums at AndroidCentral.com - Ask a Question http://ift.tt/2ho4CzI
via IFTTT