What would make a car with less than 1100 miles on it just cut completely off at 50 mph. We were on the freeway with 2018 Hyundai Elantra
Ask your dealer, the car is under warranty.
Did you ever find out what happened to your car? What was the end result of attempting to remedy this issue? Mine did the same and locked, currently getting a engine replacement done.
Sorry for necroing, just information gathering.