Hope someone can shed some light on a problem my friend is having. He has a 5000w rear hub kit with controller, and tft display - they are all matched leili (chinese brand) components. He has a 72 volt battery as well. The problem we have is that he seems to be destroying the controllers and we don't know what is happening. So here is what happens. Gets brand new controller made for 5000w wheel. Fitted it, had to change sensor and hall wire combination around to get motor to run perfectly. Then within a day bike decides that it has had enough of that controller. Without warning it starts to pulse power, slow down, and make a loud noise from the hub. When the bike is pushed the hall sensor fail light flashes on/off for a split second as the wheel rotates. First time around we changed out the controller - fixed the problem - then within 1/2 day the same problem arises, and we cannot keep buying controllers. We don't know what is happening here and would really appreciate some advice.