After waking from sleep or just after docking to my surface dock, the on screen volume control is stuck in the upper left hand corner of the screen. I am not able to X out of the box, or adjust the volume. Same is true if i go to the volume control in the task bar. The lower control says Speakers (surface dock), the slider is set all the way to the left, if i try to move the slider, it pops back to the left. how can i fix, or at least is there a service or process i can restart. thanks.