I running a BlackBox with a setup similar to the ACRO 1010 laser using NEMA 17 motors with only X/Y axis. I was running fine until my Y axis began to vibrate and no longer ran smoothly. I loosened the belts and found my Y1 motor was vibrating and not turning. I took another motor laid it on its back and plugged it in and it spun smoothly. When I placed it on its side, it vibrated and no longer spun. I tried this with the original motor with the same results. I switched out the black box with another (I have a CNC router as well) restored the GRBL settings with the same results. Thoughts?