Quote Originally Posted by hfjbuis View Post
Even if you didn't change anything, it is always good the check if somehow settings are changed!

You should measure the voltage input on the input of the controller during idle and during run. During run it should "match" the output of the power supply.

Turn the stepper by hand, unconnected it should run smooth. When in doubt, compare it with an other motor.

If you can, swap the stepper to exclude it as the cause of your problems.

If you can, swap the driver to exclude it as the cause of your problems.
Found out my problem was a bad wire in the wire loom connected to the arm. Thanks for all your help and suggestions.