A couple days ago I went out to fly the Karma Drone near the ocean... I waited for the GPS signal to acquire which it did. I was on a hiking trail going along the edge of a cliff. I sent it up in the air and got a few minutes in...Since I was on the edge of a cliff I let the drone hover for a second while I found a good flat spot to get my footing. When I looked back down at the controller I noticed it said "Sensor Error" - Returning to Launch site. I looked up to see the drone and it was raising in elevation, but did look like it was headed back towards me. I was panicking a bit since I was on a narrow hiking trail. To it's credit it did return to my location, but not to my exact launch location. It ended up landing on a not so even surface and flipped over off of a rock. Amazingly none of the blades broke, and it seemed fine. I took it to a new location shortly after and re calibrated everything. I put it back into the air (Lower this time) and tried to make sharp turns. Quick stops etc as a test. It seemed to operate fine. Anyone know what "Sensor Error" would mean? I've tried googling this and haven't come up with much.