I have a Naza-M for my quadcopter. It is 13 months old and has performed very well. Yesterday, I connected the power and heard a louder spark snapping noise than I have heard before. The battery plugged in ok and the quad flew just fine except the GPS mode does not hold at all. I landed and went through the compass calibration many times but it always resulted in rapid flashing red lights. I tried to update the assistant software to the latest 3.16 but it will not recognize my V1. The assistant 1.8 does recognize it fine. I know the 3.16 has more compass functions that I wanted to try. I might need to send this in for service. Where should I go?