I had a small crash with my drone and it's all my fault. 1st I used a new phone and never changed the return to home battery level setting. I was about 1 inch from the ground and the return to home kicked in started to take off. Well I was landing it in the garage that was mistake #2. When it hit the ceiling and came down it started to come at me so I pushed it down with my hand and it landed, that saved the drone but cut my hand up. Now everything seems fine with the drone and the propellers are fine. The only thing I can find wrong is I have some play in the motors. I can pull 2 of the shafts up a bit, it seems that the armature is pulling up but when you let go it goes back into place. Someone said that the bearings need to be replaced after sometime and you need to tighten them if they get loose, is that true? I have not tried to fly it until I know the motors are ok.