I have had quite a few stalls on this new bike. It is usually when cold on a first accel then coming to a full stop. The last two days it did it warm. It is always when coming to a stop or chopping the throttle. I am afraid the dealer will claim ignorance or say it is EFI they can't adjust anything. I lived with Rincon stalling I learned to keep on the throttle a little when stopping etc.
I contribute it to the primary opening too slowly on decel. Or something similar where the belt is keeping a load on the engine at closed throttle and it dies. It takes some throttle to fire it again. Otherwise it cranks too long like 20-30 seconds before it fires. With throttle it catches in 3-5 seconds.

I also got a few backfires up the intake when stabbing it from a stop.

i used to get backfires when stock, but don't have them anymore, no stalling ever

We rode out at Pawnee grasslands yesterday. The Brute seems to be running pretty good. Not sure what I could advise about the stalling.
I have noticed a stall if I blip the throttle when stone cold. Once she's warm that symptom goes away.
Also it takes the ECU about 2-3 seconds to poll the sensors and calculate base fuel before startup. I just wait for the FI light to go out before cranking.

A few have reported Faulty Check valve at the Fuel tank which lead to Stalling on the '08.
Allow computer to "boot" before trying to start like Rock on Suggested.