That makes sence, one of the wires was too short to make a good contact.Yah jumps like that are cause one of the three isn't making a good connection so with 2/3 it's able to sort of get the rotor spinning but misses firing the third set every time and eventually causes it to get pulled backwards to a stop instead of being pulled towards the next set of electromagnets but at this point probably would also just replace to not play guessing game on which one of the three is not great easy to connect them when have leads you can easily tin/coat with solder before making the connection to wires going to esc(s)