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Hello Paul. My name is Tan.
The only other switch that will shut engine down is oil pressure switch. Have you changed the oil? We need to check oil pressure. If oil pressure is in spec then you have a bad oil pressure switch.
What you can do is disconnect the oil pressure switch and see if engine shuts down. I can't see it loosing oil pressure after running that long all of a sudden. More like a switch failure.
Correct have you checked either of these switches?
The way to test the switches is to test each switch when engine is running then test when engine shuts down. Use an ohm meter.
Ok it is best to test them when they act up. What I do is test before start up, then test when running and finally when genset shuts down.
Post back with questions and findings.