I've just got my machine going, and I'm getting quite a bit of interference to the steppers. I'm using shielded wires to the steppers as well as to the c10 board, but the power wires aren't shielded. Is the foil or bare wire supposed to be attached to anything? Do I need to swap the power wires with shielded wires? I've noticed it more in the z axis when running x or y it tends to step down a little. If I move the z towards the top it stops. Each driver is wired to its own +- posts on the power.