OK, since a few days, I have some vibrations on my videos. - Yes I bought the DUBO to balance my props - Yes I balanced my props - Yes I checked if everything is screwed - Yes I check each motor with GHI program (so strange noise or vibration) - Yes I use the last firmware everywhere Here is the video I made. Sunny day, no wind, Just go up, wait for 10 sec and go down. See by yourself. If anyone has a solution, I'll give him, my car, my house, my dog and my wife !