Driving me insane

[JAZZCNC]

When it goes wrong the g-code stops in it's tracks along with the machine and then carries on but not in the right place or one of the X or A stepper motors takes a extra second before moving with the other one.

Ok this needs explaining better.? When you say the G-code Stops plus Machine then it carrys on do you mean it pause's for a second then continues.?

If so then this is indicates a computer problem and Something is interupting Mach. If this is the case then don't do anything else to wiring or Mach setup untill you've fixed the Computer. Mach cannot be interupted for even a split second otherwise it will cause lost timings in the pulse train and you'll get exactly what your getting.

Remove any virus checkers, Disconnect from internet and turnoff any wireless, Turnoff screen savers and Energy saving features, Remove Apple Quick time or Adobe products as they cause interupts.
Infact remove any programs that you don't need.

You need a very basic stripped down windows with just Mach on it.