Share your experience!
I have registered daily turn off all sound at 22:00 except alarm, and turn on at 10:00 or when alarm. On previous XPERIAs this has worked flawless. On my XPERIA XZ 1 II this seems to be a bit buggy. the sound auto off works ok but the auto on seems to not work at all. It doesn't turn on sound at 10:00, nor does it turn on sound when alarm alerts. In my eyes this is a bug. I've removed current settings, restarted phone and added new settings without success.
Did you try to check if there is a software updated available to be installed?