Truck shuts down and will not start

Truck shuts down and won't restart. Or at least won't restart until ECM is disconnected and reconnected.

Has done this once at a stop sign while in idle and once again while running.

We have checked battery, alternator, replaced ground cables, replaced fuel filters, checked codes, replaced oil sensor.

There is an oil light on even after replacing sensor.

Other than that the truck runs like a top right up until it shuts down and won't restart.

Drove it 5 weeks before the first time and 2 weeks until second time.