Hi
thank you for replay
to Rich
i did no. 1, 2, 3.
the machine is from china. ( working travel  850,480,65.) stepper motor type (57 two phase  3A super-low noise)
spindle motor 0.8 kw  VFD spindle .
spindle speed 3000--9000 rpm 
resetting accuracy 0.05
the massage error is external  emergency ...
i increase the Debounce Interval to 1500 but still after some time it is stop.
if i give sample job it is ok but if it is need cutting and pass more then one time i face the problem.