So just an update, today I finally received a completely new replacement Mavic (I was under the impression they were going to just fix the gimbal issue). Update to the latest firmware .700 (fingers crossed) and no issues, the gimbal calibrated properly (as did the IMU & compass) At start up the gimbal went through its motions, but this time it was smooth and without the violent thrashing that you see in the videos from my initial post. Took it up for a few flights and so far so good.....just have to get my settings back, since the update wiped everything back to default.