Motor Problem

Can anyone identify the noise this motor is making? It seems to be “skipping” and not traveling the correct distance. Could it just be a wiring issue? I haven’t done anything to the wiring, but yesterday I secured and tightened up the belt for this axis.

Yes, i’ve been using it for over a year now, it just started making this kinda grindy noise when it’s running. I just took the belt off to show the gear slip, but its hard to capture on cell phone.

Well, I let the machine sit for a few hours and came back and the motor was no longer making the noise. I tightened up the belt and it moved correctly. ¯\_(ツ)_/¯

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