I have a 3 axis router that uses 2 motors on the Y axis- basically 4 linear actuators bolted together. They are full step NEMA 23 Vexta motors, 5 wire , the drivers are potted (the motors and drivers came as a piece). I generate code in a CadLink application and use Dancad or Danplot as a controller. It's worked fine for years. Last week the left hand Y-axis motor started holding for 10 steps every time the direction changes fron CW to CCW. I've switched cabling, reloaded software, checked for mechanical interference- it still does it. Driver chips being solid-state, I can't imagine a failure being so consistent, though I'm no electronics wizard. It's not stalling so I don't think it's a power supply issue. Anyone have some thoughts on this? Thanks