could be 1 of 3 i can think of.
1st thing voltage seting on the esc what is it set at?you want the lipo cutoff set at 6v no lower if its higher such as set at 7.4v it will stutter when the voltage gets to 7.4v.
2 receiver cutting out but when this happens it wont stutter it will just stop nothing will happen till it rebinds.
3 faulty sensor in the motor or sensor cable not connecting properly try some blue tac on the plug to the motor to hold it in and on the esc.
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