I received my MA2 on June 5 and I don't have a lot of flights on it, maybe 40 total. I flew around a little last night and while the props were slowing down when it was landing I heard a grinding sound. I removed all of the props and checked each motor, I have two motors (same side of the quad) that have quite a bit of play in them and the bearings sound horrible. I have not crashed it or hit anything with the props. I've been building and flying FPV drone (currently have 16 and have built close to 40) for five years and the only time I've had a motor go bad is from a horrible crash or having dirt get packed in them. The MA2 is my first camera drone and it's a little a discouraging that after a little more than two months I have two bad motors.