Did the new motor solve the issue? I have a similar problem with my 2015 genesis. Only 17,000 milesI also went through the same rigmarole. It worked until I left the dealership. I took it back to them and they kept it for 3 days and replaced the drive motor. Luckily I was given a G70 as a loaner which was comparable to the 2015 Genesis 5.0 which had this problem.