I built my first quad, the ARF kit 450, with the Naza V2, and Specktrum radio and rec. I flew the quad around a dozen times to make sure it flew well before adding the camera, gimbal, and FPV devices. Once I installed those I was looking at the Boscam monitor while the drone was hovering about 25' up. Everything seemed good. Then all of a sudden the quad starts to list to the right and kept going. I could not correct it so I continued in that direction making a circle while bringing it down. I was able to get it down with a tumble and no damage. I tried the quad again and the same thing happened after a few minutes of flying. I was wondering if one of the motors is bad. I would rotate each with my finger and one of them have a much more noticeable detent than the other 3. It clicks more on the finger while rotating. My hunch is that once it gets hot it may not be preforming as well as the other motors causing the list. Is there anyway to verify if the motors are working well? THANKS!