Good day all, I've been tracking this thread and wanted to let all know that I had this same issue yesterday on my first, longer ride on my 2014 R3R. It happened around the 110km mark on the odometer near the end of my 100 km ride.
Gearing down from 4th to 3rd, clutch in, throttle off, engine stalled. A others have mentioned a quick push on the starter I was back running. It happened twice, that's how I found this thread.
On another note, I did about 125km today and no problems, no stalling. Bike ran like a charm. I'll still mention it to my dealer when I take it in for my first service at 800km.
I love this bike!
Cheers