Our Sonata stopped responding to the accelerator at speeds exceeding 45 m.p.h - it would behave as though engine is decoupled from transmission. Check engine light is NOT coming on. We were able to drive it to the dealership Fitzgerald Mall in Clearwater, Florida on April 29, 2021. They said they could not look at it until May 3, 2021. We think it is a power train problem and should be covered by your 10 year warranty. We are hoping you will intervene and have the repair or diagnosis expedited.