If you go to the XHC website and read the read.me file for the USB driver http://www.cdxhctech.com/html/edownloads/view_282.html

You will find a section on how they have issues with some probing scripts. I would get the exact wording for you but I cannot view the file on my phone. The offer a work around by recommending that the 3 axis DRO calls are replaced with a different call.
I had the z axis crash problem on mine until I incorporated their recommended fix. It was simple enough to do and has been running great for months. If you have difficulty finding the fix pm me and I will dig it out for you

Steve


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Thank you, i will look into it today.Tomorrow i will leave for at least 6 weeks (off-shore work) so if i cannot comment today.... i will get back to it when i return.

thanx a lot for your offer, this forum really works great because of the friendly people here. Do you speak chinese ? i just looked into it (first glance) and i really do not understand how somebody could understand it, if you don't speak/read chinese.