I've had mine up and die a half dozen times - almost all were as I was coming to a stop. Only once doing 75mph on an overpass.. SHIFT-N, turn key, keep going...

It was a ghost in the machine thing for a number of us. I've also read here that it could just be a hiccup in the programming and miscalculates fuel feed ratio causing to to run too lean and stall...

It happens a few times a year to me so I don't sweat it.