Hi my name is Aubrey. I have a FLX trail F1 ebike. It has a mid drive motor which I have been unable to find out who made the motor or anything about the motor. I also dont have a clue where the controller is. Anyway it was working fine for about 4 years and suddenly it wasn,t. I was going up a steep hill and pulling approximately 610 watts when suddenly it wasn't working right. The motor started vibrating and making some noise and appeared to be unable to find the right gear. I replaced the chain and any gears on the back wheel that appeared worn. This did not fix the problem. The bike works fine as a bike with the power turned off. The battery is a 36v 15ah and is new with 1 full charge. Actually I have three batteries and they all charge to about 41.5v. Does anyone able to give some direction on this problem.