Good Evening! I have a Rockford Fosgate R500X1D Amp installed in my car powering a single 10 inch sub. Whenever I am idle and am the car is not moving, the sub and amp both work fine as the sub hits hard and the amp has a solid blue llight on it. However, when I start to move, the sub cuts off completely and the light on the amp starts blinking red. Why does it do this when my car is moving (starts right after I shift and takeoff in first gear) and what is causing it to do this? I have a 2013 Hyundai Elantra manual Transmission. Thanks!