Hello, Thank you for the replies.

So having read the suggestions and getting some time to address the issue:

Firstly, no mechanical problems with the machine, took the stepper motors off and checked it all turns freely. It's not mechanical wear/failure.
Secondly, no loose wires. All checked for continuity (as much as I can - obviously I can't check inside the stepper motor).

Wrote simple G-Code file to motor x axis back and forth around 100 times. No problems. On returning to a complicated spiral cutting pattern creates a sporadic stall again.

I hear the suggestions regarding power supply, I'm on a starters learning curve at the moment. I have obtained a 48V 600W 12A supply and have changed to over.

Doddy, you mentioned what are my micro steps on my cw8060 Set to: 4.28A, Half Current, 1/10th microstep. Am I limiting current thus causing the problem?

onwards..........