I am a newbie with a P2 and Zenmuse that arrived yesterday. The gimbal "shutters" (vibrates) for 1-2 seconds every 25 seconds. It is very loud. The gimbal sounds like to it trying to tear itself apart. What is the gimbal trying to do? I don't have a GoPro installed, does that matter? Should I worry, is the gimbal defective? Why is the gimbal vibrating every 25 seconds?