The first thing I would check is the battery base in the battery compartment. The Rosenbeger connection is magnetic and attracts the smallest metal parts.
Clean it with compressed air or a lint-free cloth. Do not use any contact sprays or greases or WD40 universal.
Secondly, check the motor connector in the left-hand chain stay for tightness or moisture.
The phase cables of the controller could also be the problem. They were not sealed on older models e.g. ST2.
The distribution board in the battery compartment also sometimes causes problems (corrosion)
>> See more here.
Clean it with compressed air or a lint-free cloth. Do not use any contact sprays or greases or WD40 universal.
Secondly, check the motor connector in the left-hand chain stay for tightness or moisture.
The phase cables of the controller could also be the problem. They were not sealed on older models e.g. ST2.
The distribution board in the battery compartment also sometimes causes problems (corrosion)
>> See more here.
![[+]](https://www.stromerforum.ch/images/stromer01/collapse_collapsed.png)