I was flying my drone in a valley (La Quebrada, Acapulco, Mexico) and when the drone was approaching the end of it I started climbing up. Exactly at that moment the GPS signal was lost and the drone continued going forward and not up for 1-2 seconds, which was enough to hit the wall.The drone fell about 20 meters down, rolling down the rocks, the battery got spelled out, propelers broken, one arm was bent, etc... Two days later I decided to replace the propellers and fly again. After an IMU calibration, the drone was flying like new again.
I sent to DJI for repair and within about 2 weeks the drone was fixed (new housing, new motor, all checks), at NO COST.
Very happy with the customer service.

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Happy flying!