I know this is an old thread but wanted to give feedback on the issues on this model where the motor does not spin or spins erratically. I have found on this model that the coil wires on the brushless motor get corroded by the glue holding them down and it eats away at the enamel and the wire itself so it shorts and or breaks free. In my case i had both. The coil wire used to leave the motor winding and attach across and to the posts turn black and fall apart. Look for this.. unfortunately in many cases this cannot be fixed and will need a whole new motor stator.