Thx for any help, OK I have a newer Phantom 2 with the scroll wheel, a H3-2D, a GoPro 3+ Black, and a thunderbolt tx. It starts up fine, gopro charges, so gimbal is getting power, it all works (and yes I know about the scroll wheel only works properly with the H3-3D), you take off and the gimbal goes limp, battery is fully charged. You land, it all works, sometimes you start the props and the gimbal goes limp. Sometimes in flight it goes limp. Any ideas, apart from opening up and checking connections. Thanks again.