Hi all.
 After quite a while of trouble free motoring, today I have random z movement, from the keyboard, and from the Tab controls. (press down get down, press down get down, press down get up
Unfortunately it is halfway into an 8 hour job, but stopped overnight.
The only thing changed recently is a bigger heatsink and fan on the cpu, and more memory, because the long files were causing crashes due to overheat.
Any ideas guys?

Jim

And will change direction on the same key press
Jim

I remember Chaoticone's advice to me last time, check the connections on the gecko. seems to have cured it. just posting the question helped me think about it in the right way, ie not in a panic panic panic way.
Thanks for being there guys.
Jim