Just received my replacement fc40 since the first would not bind with the transmitter. Flew good 2 times then started to drift. I hooked to the naza on my computer an turned on IOC. Also did the advanced mui calibration. I did not calibrate the transmitter as it would not connect thru the fc. Today took it out to fly and was able to use the s1 switch to calibrate compass. However the motors will not start via the sticks?