NHTSA Complaint #11626404 — 2024 LEXUS NX

My vehicle has a vibration in the steering wheel and floorboard between approximately 38-48 Mph but mostly around 43 mph. It is random in severity and sometimes feels like the vehicle has a flat tire.With this issue it is impossible to determine if the vehicle has a tire out balance, an alignment issue or some other drivtrain component problem. This could cause someone to pull the car over to check the tires and impede traffic, possibly causing an accident. The dealer couldn't detect the vibration. After 4 months an FTS finally detected this vibration on a test drive. He then said it was normal operation characteristic from the hybrid powertrain. I was told all of these vehicles perform this way. I've driven 2 other vehicles, identical to mine, that absolutely do not exhibit any of the vibration and harshness my vehicle does. This is an unacceptable "driving characteristic" of a $52,000 luxury vehicle. There have been no warning lamps or notifications on the instrument panel. This problem has been present since new (December 2023)but took me about 3 months to narrow down what was happening and at what speed. Rough roads can disguise this vibration but can be felt nearly every time the vehicle is driven.