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DRV8307EVM: The motor does not rotate properly

Part Number: DRV8307EVM

Hi, I tested the demo board DRV8307EVM with a brushless motor (it's a wheel of a standard hoverboard, three-phase with single-ended Hall sensors, 5V supply, without reverse polarity). I've find that when the motor reach the constant speed, turning low the Lock signal, the motor does not rotate fluently, it freezes and then restarts with the rotation. I've not doubts about the motor because I can drive it correctly with another board. If I change continously the PWM for the speed or if I apply resistance to the rotation of the motor preventing it from reaching a constant speed the problem not occur.  I've tried to change the connections of the motor phases but in the best case I've obtained that the motor rotates constantly but with very high noise.

What could be the problem? I've not modified the demo board, connected as it is only moving the jumpers in the correct position for my application.