I have a 16 month old GV80 3.5 T Advanced Plus and love this car. (20,000 miles). I also have had some annoying issues with the tranny and almost from new. In my case when I coast slowly up to a traffic stop, the transmission bangs fairly hard into first gear, it's a definite hard clunk you can feel. It doesn't do it all the time but often enough. Dealer says they can't find anything wrong, surprise!
Second issue I had was just a few weeks ago, I was accelerating hard to pass a line of cars and dump truck on a single lane road, during the overtake the transmission hit the rev limiter and refused to shift to a higher gear, stalling out as I was passing this train. Not sure what gear I was in but I was doing around 80 mph so maybe 6th? It was only when I lifted to back out of my overtake, did the tranny suddenly shift to the higher gear and I could complete my pass safely. This was a little disconcerting I can tell you so back to the dealer next week.
Other then that I've no issues at all with the car which has been great. Occasionally it'll have some strange stuff happen like it'll just shut off at a traffic light which requires a restart with no further issues. Also sometimes my infotainment systems acts up and nothing will work. Turn the car off mostly fixes it but sometimes I'll need to have it off for a period of time and all automatically resets. Note: these modern day gremlins are few and far between in my Genesis and are not uncommon in most other brands, I had similar issues with my Audi Q7, another great car.