I was messing around in my channel settings seeing if the aux button could be programmed to GPS. I thought I had added something and deleted it. Well.. It was button 1 (start/stop) not button 2 (aux) that I deleted. After recovering from heart palpitations I called Yuneec US support. The system let me reserve my spot and have the support person call me. A gentleman (wish I got his name) called me back a short time later. In no time he had my St16 back to normal! Very impressed that they were open on Saturday and was able to immediately guide me through fixing the problem.