Started having trouble with the Z axis on our printer. It has worked fine for over a year then after adding octoprint to it (which I don't think affected it) I'm having problem with the left stepper motor acting oddly. When the printer homes the left motor seems to hesitate when it starts to move and then again when it changes directions thus making the bed no longer level. I've tried several things already, changed the stepper driver, increased the voltage, changed the stepper motor and checked the bed tramming. In the video you can see the left motor hesitating when I change directions just moving the bed up and down. Anyone have any thoughts?