Motor Chatter
 

I am flying a Freedom 3-D with a AXI 2826/10 motor, Jeti Advance Plus 40 Amp speed control, e-tec 3s2p 3400 10c battery, 12x8 prop drawing 35.4 amps. My problem is: a motor cut off at about 2 minutes into the flight. I'm beginning to think the problem is with the battery at 10c. The battery should handle 34 amps, so I'm pushing it using the 12x8 prop drawing 35.4 amps and understand the cutoff. But when I throttle back, after the cutoff, and then fully advance the throttle I get a very loud chatter emitted from the motor. What is causing the chatter from the motor????