Not my video, but interesting if it has something to do with altitude drops some pilots expirienced. Would be great to hear from them which props they had while having drops.

Hi. Thank you for creating this posts. With regards to this matter. It is recommended to always do a preflight inspection on the drone in every flight specially checking  the propellers of the said drone. If you noticed any damages, scratches or deformity on your drone's propellers. Kindly please replace them right away to ensure the safety of the drone during flight and to avoid any untoward incidents. If after replacing the propellers and you are still experiencing the same issues. The best thing I would recommend is for you to contact our DJI Support Team to start a ticket to further diagnose and for us to know the cause of the issue and a proper resolution will be provided. Thank you.

Hi, on the net I don't find different types of propellers, but I would be interested in a quieter set, I find the MM noisy.

Check this thread: https://forum.dji.com/thread-203585-1-1.html

Thanks great post, it would also be good to know more about the props hitting the drone.

There are some really nice aftermarket props out there all carbon fiber. They are about $90 USD for a set, but I love them. My Mavic 2 Pro is not as loud and they are super stable. Non folding though, so if you use a case they will need to come off before you button it up in the case. I'll look and follow up with a post of the brand. I got them on Amazon. I've used them over 100 hours now and I do pre-flight inspection before every mission and they are so far in great shape. I would not use if your a beginner as these hard props can possibly cause some damage to the motors if you hit something not to mention someone. Just my 2 cent