System doesn't unmute notifications

[Rena Quick]

When I mute using the hot key in the tray, all options go to mute. However, when I deselect same button and return soind, media & calls return to same level as before however the notifications option stays mutted. It didn't always do this but it's been going on for at least a few months. I'm up to date on system updates. Android 9 Kernal 4.4.153 July 31.

Any known fixes?