Thanks for the info.Now that sounds more like the unintended acceleration software kicking in. Are you a two footed driver or really fast from brake to throttle / former street racer? If so that is probably your cause and there will probably never be a fix for that. I am a two footed driver and every now and then I still get that software to kick in. I always had quick reaction times and I am just too fast. HATE it but have not found a way around it.
So I think (again just conjecture) we have at least 3 different scenarios that can trigger the same obserable symptom.
1) ESC kicks in and you lose all power for about 2 seconds. (So far have only duped it myself by the Pothole of Death, and one possible wild hairpin turn at high acceleration).
2) Downshift delay issue thingy.
3) Unintended acceleration thingy. In my case I know for a fact never had foot on brake. But in these cases, I'm fairly certain I needed acceleration "now", vs. "normal" (in #2 only had happen once).
The puzzling part (to me) is that nobody seems to have this on the 2016 models (or earlier). And either way, still sounds eerily like the V6 SF LWB TSB that I *think* was fixed via reprogramming the TCM module (but I don't have access to the TSB anymore, nor do I know what exactly the code changes/etc. were/are).
Perhaps I'm more careful now with accelerations (either consciously or sub-consciously), but have definitely had #1 happen 4 times in total now (3 times with a particular pothole, but I've been purposely trying to dupe it after the first time and even then it's extremely difficult to do so as you have to hit it at just the right speed).
Too bad none of this gets recorded in the computer anywhere, and apparently even with a "recorder" I doubt it'll show up because the tech I spoke to said it only records things where the vehicle is NOT operating properly. So if Hyundai programmed something to behave this way (ala: SFS V6 LWB issue), it'll never show up in a log anywhere. Not sure how Hyundai figured out the V6 issue (maybe they drove a bunch around until they observed it and then had special engineering stuff that dealers don't have access to to figure it out).