So a quick report!
Have loaded a new Mach 3 profile which does not seem to help.
I have checked connections and cant find errors , I have even run a new cable to y axis direct from driver to stepper and no improvement .
Havent yet managed to install UCCNC but working on that.

I am beginning to doubt the quality of kit I have , UC100 was obtained from a trusted source but could it have been spiked by other duff gear?
I have had a couple of dubious Breakout boards , How do I know this one is OK?
I have bought drivers from cheap sources as well as trusted sources but how do I know where even the trusted gear is being sourced ????
I did have a failed motor , but all seem to run sweet now ,
But all this kit seems to come from china so how on earth do I know what I am getting? and it is all so fragile anyway so if I get a failure then it is inevitably my own fault cos i must have shorted it ???
Is it worth paying the extra for gecko say? Should I get new motors too and from where ??
This seems to be a satisfying hobby but more than frustrating if things are going wrong.
Rant over