My 2018 ATAS DCT did the whole stalling thing too when I was on a trip out to Colorado in September, started when I was riding miles off road up a trail in the mountains after I had ridden all the way across 6 states from the East Coast. Ran like a champ before this happened. 3500 miles on it.
Bike bucked like crazy for a bit then stalled out, did it a few times. Start, run 5 min then stall etc. 10 times or more.. had 1/3 tank of gas or so, no cellphone coverage, I thought I was sleeping out under the stars... I sat for an hr then the bike started and stayed running, I made it off the trail, gassed up with a full tank and headed back to town.
Went to the dealer first thing in the morning and he couldnt reproduce the issue and there was no codes stored in the computer. I left the dealer and within 10 minutes it was happening again, bucking like crazy and stalling, so back to the shop and told the dealer. He then took it out and it happened to him too.
He talked to the Honda Service rep who told him there was an issue reported by another dealer where the fuel filter was plugged with a wax coating from when the tank was made that might not have been completely cleaned when the bike was assembled. Tanks were all built and stored before the bikes were assembled I guess ?
My guy took the tank off and sure enough the fuel filter was plugged with a white waxy substance.
Dealer cleaned the filter and washed out the tank. Reassembled and all was good, no further issues since. Honda also very nicely paid for a new Fuel pump install when I got home, in case the pump was damaged when stalling out.
All good since, Honda took care of it I'm happy to say.
My bike is a really low serial number bike, so an early build for Honda.
Love the bike, the Adventure half way up a mountain adds to the fun...