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The machine does not use PLC technology which also makes for a lot of contactors outside the controller.
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Sorry if I am suggesting something that you have already checked, but have you looked at all of the contacts on the limit switches and the contactors? If the operator is shutting it off and on at the transformer, would it be possible to arc across one of these? The symptoms sound like the controller is "confused" and thinks that the saw is done, when in fact it hasn't even started. The magnetic field collapsing in the transformer when it is turned off is going to make all kinds of crazy transients.
For what it's worth,
Trainwire
