Well I haven't a clue, really. By the sound of it those motors aren't on a flat battery. Could be radio issues I suppose... have you got an alternate radio set you can try the setup on? If on a different tx/rx combo it still happens then that narrows the diagnosis some.
Edit: suggestion of opening the ESCs up and having a look is a good one. It's very odd that the motors stop dead, since Electronizes don't have braking. Sort of suggests the motors are being sent reverse polarity for a split second, stopping it dead, then continuing as normal? Don't know!
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