I am now having a similar issue that @TightnTapered was having with the X-axis. The X-Axis is doing the same thing as in his video video above, just a little more randomly from no move to short move to quick move randomly. Using UGS with X Y step set to 10 mm. Y axis is fine.
Everything was running fine last night, until the end of the night when my x axis started moving slowly or erratically. The stepper motor seems to be intermittent. Tried hooking up a Y Axis cable, same issue. Also tried the Z Axis cable with the same result.
Checked the eccentric nuts and they are still where I set them during the build - V wheels are hard to move with fingers but Z Gantry moves smoothly when turning the threaded rod. There is no play left to right on the threaded rod or slop left/right/up/down on the z axis gantry. I have not touched the anti-backlash nut, still also set where it was on the build. This is the V2 controller.