Ok this just got even weirder. Before bed last night, phone was already in DND mode, mute switch off, confirmed ringer was at 1/2 volume. Woke up for some reason a few hours before alarms go off and randomly decided to check the phone which had been sitting on my Anker wireless charging pad as usual. Ringer was way down!!! This doesn't make any sense. I don't know if this is some general random glitch in iOS (though as I said I noticed it on 12.x as well on my X) or if there is something jacked up in my install and when I got my Pro Max I restored a secure backup of my X to the phone and maybe it brought something with it. I really don't want to do a clean setup without knowing for sure it would stop this behavior vs if I just have a misbehaving app.