Does anyone have any new info on this problem? My phantom 2 is doing the exact same thing. I have a h32d gimbal, iso mini, and dji video downlink. I've added an orange rx8 through the s bus and use a spectrum dx9, and run carbon fibor props it flew great about 10 times, then randomly started losing throttle control and drops uncontrollably, Its not ring vortex, or low battery. I've tried switching to manual and giving it full throttle but no help. It's not losing signal because it doesn't go into failsafe, which I've tested and that works....I'm at 180' above sea level.
I have never been a fan of the orange Rx. I would try another Rx and see if the problem persists.