The Westerbeke 7.0kW BCGB generator on my 2000 380DA has exhaust temperature, oil pressure and water temperature switches wired in series, that stop the gen during a fault from any of those sensor switches.
The gen also has a secondary oil pressure switch wired for an external alert.
If your generator has a similar setup then my speculation is something on that secondary oil pressure monitor was not happy, such as intermittent wiring connection.
