I bought a new I3 Pro A, after the building and wirering I tried to start the printer.
The problem: When I choose "auto home" the x-achses should move to "-", it moves to "+". Today I tried again and now the x-achses is fast moving/shaking one or two mm to - and then one or two mm to +.
Do have anybody a solution for that?

I already controlled the wirering, same as at the functional achses.
I also connected the x-motor to the port of the y-motor, on this port the motor works fine, should be a problem with the x-port, the x-stepper driver or in the programm.
thanks