Not sure which motors you are using but it could be related to what @g90ak is saying here:
I have the same problem with the motors I got from FUNOSR last year. So far, it doesn’t cause problems when using it though so it doesn’t bother me too much.
Not sure which motors you are using but it could be related to what @g90ak is saying here:
I have the same problem with the motors I got from FUNOSR last year. So far, it doesn’t cause problems when using it though so it doesn’t bother me too much.