I am troubleshooting my Panasonic TVS100 Voice processing system which is hooked up with D816 and my boss is thinking about replacing this system. The TVS100 is making a slight staticy sound and the light stays off for 8 seconds.... blinks red 4 times and repeats this process. There is nothing wrong with any of our phone lines. Why is this noise happening and why is the light blinking like this?? Anyone know??? Please Help!!!