I restarted my phone, made sure nothing was on mute, I shut down every running app but what ended up working for me was going to System Settings> Sounds & Notifications> Sound Profile and selecting "Silent". That seemed to restore normal function. I could not put my phone on silent through the status bar. And all my volumes were grayed out as well. I was able to put it on "vibrate" and "sound" but not "Silent".until I did it through the sound profile
Originally Posted by
Mike Gonzales Nevermind... I just restarted the phone and the notification slider is now working. So I guess this is a "is your computer plugged in" tech support moment.