2018 Hyundai Elantra drivetrain & axles problems

I bought the car about a month ago. And today I experienced the car while driving at 55MPH when I went to accelerate to go the speed limit of 65 on the major highway going into salisbury, md that the car wouldnt speed up. And about 30 seconds later the transmission seemed to have down shifted a couple gears due to the rpms going from 4600ish RPM down to 2000 rpms and than the car went back to normal.

The contact owns a 2018 Hyundai Elantra. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed however, the vehicle did not drive smoothly. The contact stated that the vehicle was consuming an excessive amount of oil and fuel. There were no warning lights illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The approximate failure mileage was 130,000.