Hello. I am enjoying assembling this robot cat ,Nybble . But I can't finish setup. I can't finish calibration. I tried calibration more than ten times. But I can't finish because the cat move abnormally. After I typed 'c', all servos were moving and stopped. After stopping I tried to calibrate and joined leg parts. And I calibrate each of servos, the 10th servo, the 9th servo, the11 servo, the8 servo, and the cat abnormally .In that case I can't stop it. Several of servos moved abnormally. After that I unplugged USB cable from uploader. And I reconnected USB cable. But the cat move abnormally again. So I have no choice but to reset the cat. Is this cause battery trouble? USB cable trouble? and other? Could you tell me the why?