I have been having this issue on occasion where the x1 stepper motor will drop out. I believe the issue is with the driver because when i switch the plugs for the x1 and x2 motors the problem changes to the other side. I am running the 4g controller with the G202 drivers. The light on the gecko driver for X1 lights up only not as bright as the other 3 drivers. I am suspecting driver but want to get some more input before i go and buy one.
Thanks
Jeremy