So mistakenly I calibrated the ST-16 when my right stick was "sticky". Now the right stick has a slow reaction left to right and right to left. where the left stick has almost instantaneous response, the right stick takes a while to dial back to the center-most values. Is there a way I can restore the controller to factory settings or will I most likely have to send it back to Yuneec? And what do you think caused the initial problem? I assume dirt.