Well, all is still not well.

I had some more play time today, tried some 30A test cuts and it's messing about, stopping cut motion midway, throwing e-stops, losing co-ordination etc.

It will be even worse if i plug the PC into the same extension as the system, I have to run two extension leads back to the wall socket just to get a partial success.

If it was 100% because i have no ground rod then i would stop testing until I take the machine home where I can fit one, but I'm not totally convinced it is that.

The system has a filtered plug fitted and the pc has an in-line filter fitted.

Not sure where to focus my efforts now????