Here's a little more info. The error seems to be happening during a macro run that does a G31 Z-2. It works 3 or 4 times, then fails. When it fails, the probe trigger is ignored, the Z goes to -2 and stops. Last time it did it, the next M code (M03) executed, but since the torch was bottomed out, it failed to light anyway.
I can execute this M code all day long in MDI and it will never fail. It only fails during a program run.
I don't mind setting up another PC, but I'd like to know if this could be caused by something externally or if it is definitely a PC issue.
Thanks