So I went to go fly this morning, got all set up, and turned motors on. Right away I have some noticable vibration and my left front motor is turning at a slower rate than other 3 so I shut it down immediately. Gui says everything is fine but I'm thinking that if you can visually see one is not spinning at same rate that can't be right? Also I'm getting the solid purple with white flash on main led, then an occasional orange flash, not sure what that means. Any ideas would be appreciated. Thanks