This was all fine until I recently rewired each axis with screened cable so am suspecting that some crossed wiring may have provoked this .( I also fitted plugs in each cable so got two extra shots at getting it wrong in each side of those )
Software is current
When I connected wires the directions altered . In some cases i switched wires , in some I reversed in the software (somewhere I read that this was permissible )so I may well have created an almighty mess.
I think I probably need to go back and bell through each wire and ensure they are where they are supposed to be