Hello A colleague of mine has a problem there. He bought the part …. a (optical) beautiful 125′ scooter … Chinese design (grins) last year, and was also happy with the part, now the following happens….Roller starts well, but drives only a short distance (about 2 to 300 meters) and then goes out again. I know…. the error description is very poor, until not present. But does something happen to you anyway ? Greeting Helmut