Quote Originally Posted by John11668 View Post
Right so BoB wont go amiss. Sounds like you are pessimistic about them Daz

So am reporting back with some better news While I was jogging back and forth looking for a pattern I just happened to spot that when a jog failed , the red power light on he KK01 went out so on a failing jog the board power seemed to be dropping out.

I rigged a power supply from a 5v PSU and moved the Jumper , and Hey presto , the problem seems to have gone away.
Deep sighs of relief followed .

I will still go though the wiring and upgrade the motor cables , also see that the screening is well grounded .

Maybe get some work done now

Thanks to all of you .
Sounds promising. Can I suggest one thing - take a breath and consolidate your understanding of the problem and that is truly is fixed (I'm about 90% confident from your description), before making too many changes.