[geraldjust]

looked into the spare module i had on a bench and the mosfets looked ok. But i have a strong feeling that its the junction temperature. Please note that junction temp is not the same as operating temp. junction temp is internal to the die package rather than what directly connected to the heatsink . So even if outside was -40c if you overload the mosfet it will thermal trip. The turning off, then on after a while sound exactly this behavior. Their also no temp sensor from the mosfet location into the supporting PCB. So their no way for the module to tell if it trips.

And the only way to figure this out is by putting some data acquisition sensors loggers into the module and testing it out in those extreme conditions.My hunch, its not a software issue, its a physical one.