Hi Dan,
The schematic appears to be OK. Based on your description, OCP is the most likely event. We will investigate and reply soon.
While waiting, can you:
capture the sense voltages 10us before the event occurs? The scope captures should be zoomed in to 2us/div if possible.
lower VREF to 3.3V -- 0.22A?
try reducing the 3 Ohm sense resistors to 1 Ohm and adjust VREF?
Thank you.