Benn having trouble with my RC-N2 controller. Just started after about a month of ownership. The controller started bee when turn on. After investigating I discovered that it had to be calibrated. Did that. But when flying I noticed it would yaw to the right with no input on the sticks. Plus yawing to the left was slow or not responsive at all. The majority of the time when I turned on the controller, it would beep again and I’d have to calibrate it again. Even after calibrating it, the left yaw was slow or didn’t work at all. Never have I had to call DJI for a warranty problem. Is there a contact on their website to address this?