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Did you take out the spring and small nut on the z axis, if not you should? Why .5V? the X and Y should be at .7V or higher if you are using my hardware and steppers, and the Z should be .4-.7v. What tool are you trying to move around on your z, and what plunge and rapid rate?
Two most obvious things it could be is the Z axis is too tight and it takes more power to lift than to drop so It isn’t lifting back up. Or your z accel and step rate is too high and it just won’t move it.
Try changing the z acceleration in the firmware to 40 and the max rate to 8. This should not have to be done but it is a quick fix for whatever is really wrong with your z axis.