I have a habit of shutting down my monitor when not in use and leaving my PC running and turn it back on when I need it. If I do this with the BenQ XL2720Z it does not detect a signal on the display port and I need to restart my PC or unplug and re-plug the display port cable on the video card to obtain the image back. This is my first time using a display port setup, is this normal or may I have a bad unit?