Title bar fade

How would you fix a title bar fade problem. If your in Word and typing away after about a min forty the title bar dims and you no longer can type. You have to click inside the window to activate it so you can type. This goes for any window. Even the display properties, control panel, My computer, any and all. You open a window and leave it and then wait the min fourty you will see the title bar dim.
What is this and how can fix it?