I've had my Galaxy S21 Ultra G5 since February and just last night something strange happened. I was turning my volume down using the rocker button and needed to open the menu. I did that and used that on-screen menu to slide all of the volume controls to zero. Now the volume menu will not close and is blocking the screen. I can't even power the phone off and I'm just waiting for the battery to run down with the hope that it will fix this. In the meantime, has anyone else come across this?? I have done a Google search with no luck.