Let me first state this is the first Hyundai I have owned. I have the 2019 Santa Fe. There are times when the transmission seems not to up shift unless under acceleration. What I mean by this is if drifting downhill at about 25-30 mph and picking up speed the transmission seems to just hold whichever gear it is in at that time instead of up shifting on it's own to release pressure on the trans. There have also been times when the transmission seems to slip in 2nd and 3rd gears upon normal acceleration. Has anyone else experienced this or can it just be me new to Hyundai?