motor will not spin up

[Goshawk]

i have finaly got it done but there is one last bug to sort out, the servos will glitch once per battery about 2mins into the flight any ideas ppl, its on 35mhz 3x hs-55 on swash futaba 3116 on tail, gp750 gyro, the first glitch was the tail went 90 degree, then on the second battery was the pitch put in, shat my pants,


thx simon