So, this is quite disappointing. Brand new 2020 Duke 390 developed an intermittent problem. It started stalling, with unusual sputtering throttling issues at low speed. It would stall when downshifting at low speed, but notably it would stall when the clutch is pulled (so it's not an issue of downshifting and letting the revs get so low that the engine stalls). I've been a loyal KTM fanboy for years now. Started with a Duke 200, quickly upgraded to a 2016 Duke 390, which I rode for many years. So this is my third KTM. Took it to the service center, it seemed okay on the ride home but the problem surfaced the next day. Took it back several times. I'm no mechanical genius but I figure the issue is with the fueling, maybe a clogged fuel line or such. It runs fine at higher speeds or when you open up the throttle, but stalls and sputters in traffic. Really weird behavior for a brand new bike.