I was very pleased with the responses received by DJI support regarding a noise I was hearing from one of the propeller/motors. It seems that some of the propellers are loosley fit onto the motors and can cause some rough sound noise (when turning by hand). I put a piece of foam inside the propeller and the problem was solved. I have noticed that new propeller now come fit with foam inside the propeller housing.
Appreciate your feedback, nice to know the issue has been resolved, enjoy your flight!
Please feel free to contact us if you have any further questions.