It is possilble to get the rear calipers very hot in MDM mode (my car) under certain circumstances such as a long fast turn. I could hear one of them wailing (PFC-01) through one particular corner above the wind and engine noise. Both sides got hot enough to bake the paint off the caliper near where the antisqueek spring attaches. Pads were fine though.
Stock pads are normally very quiet but perhaps they were dragging from getting hot.