Volume dialog weirdness

[gipper69]

Been having a issue with the volume settings dialog (S&N, volume item off the settings controls ) where it disappeared as soon as selected. I can invoke the controls by pressing the button, and pull the shade down, but that's a pain. This started after the December update. Phone is now on the January patch.
Anyone else encountered similar issues?

 

[B. Diddy]

Does that happen in Safe Mode as well? https://support.t-mobile.com/docs/DOC-32496