I have just started to experience a similar problem with my bike.
2016 Full throttle with shotgun Termi's and no engine / exhaust mods (at the moment) currently sat at 1350 miles.
It only started happening a week or so ago at around the 1100 mile mark.
Approaching traffic lights or roundabouts as the lights are turning from red to green, maybe doing 1 or 2mph? Generally give it a quick blip of the throttle then pull away.
However the first time it happened I experienced the same thing as the OP, the bike died. Luckily I was quick re-firing it and pulling away before the car behind me ran in to the back of me.
It's happened about half a dozen times since, but did not stall those times, I just seem to get a momentary loss of power and slight jerkiness, which is a bit concerning when there is traffic behind me.
Normally I ride with earplugs in, so all I heard was the bang from the backfire. I couldn't locate where the bang was coming from, so I assumed that it was from the exhaust?
However.
I rode home last night and didn't have ear plugs in, and it backfired twice, and it definitely came from the airbox or around that area, NOT the exhaust.
The bike did have it's first service this week, and I mentioned the problem to the tech at the time, and asked if there was any map updates required. Apparently the map that was on the bike is the most up to date one, and has been on the bike since I first picked it up 6 weeks ago.
I doubt it's a problem that the dealer could ever replicate or diagnose, as it does seem to be a random occurrence. I've tried to force it to do it a few times now, just so I can try to figure out exactly where it's coming from, but it has been impossible to force it to backfire in that manner.
I do plan on fitting a SC-Projects CRT can in the near future, and will have the bike remapped at the same time. Hopefully that will sort out the ultra lean running and completely eradicate the problem?
I will report back.
Edit:
Just to add. This has happened at varying ambient air temperatures and weather conditions.
Last night it was approx 12 degrees C and hammering it down with rain.
It's happened at temps the same as above, and in dry weather also.
It's also occurred when the air temperature has been mid 20's too.