There are three possibilities: 1; The drive current is not set properly, 2: the drive is broken, 3: The load is too large, according to the situation you said, the third possibility is high. You can check whether there is any problem in pushing the mechanical part with the axis, clean the lead screw and light screw, if there is still a problem, you can change the drive with the drive of other axes, and change the drive when the red light still appears on other axes. If another drive is red on this shaft, look for a mechanical problem.