There was an unfortunate issue that affected a number of the motor controllers that came with the recent batch of eZee conversion kits. Due to a low tolerance thermistor, some of the controllers were prone to entering an erroneous thermal shutdown after a short while of use even when the controllers were not actually overheating. This problem would be especially acute for people running at 48V. It has been fully resolved with the controller manufacturer. If you purchased an eZee kit and had a controller that shut down and entered a state of flashing 2 times, then 3 times, please let us know. We will have a replacement controller shipped out right away.