Link to DJI thread with this information: Important Notice About 3rd-party Gimbal Protectors DJI: "Dear Customers: Recently, we’ve had some cases in which Phantom 4’s have crashed due to the drone’s ultrasonic sensors malfunctioning. By analyzing the flight data and your feedback, we found the gimbal protector may block the sensors and affect their performance. Even worse, the aircraft may half in the air if the bracket has improperly mounted. The unofficial brackets may lead the aircraft to be damaged and these situations are excluded in the Manufacturer’s Warranty. Therefore, we recommend you to be caution of the protection brackets or the unofficial accessories, especially use them in the flights." "DJI does not produce gimbal guards fro flying, only the guard to protect the camera while the aircraft is being transported. So using ANY gimbal guard like the above will void the warranty. And one post said it would be hard to prove a crash caused by a gimbal guard is very wrong. It's actually very easy to prove if a crash was due to having an gimbal guard installed."