2017 Hyundai Sonata UNKNOWN OR OTHER

I BROUGHT THIS IN OCT 6, 2017 AT WIN HYUNDAI IN CARSON. A COUPLE WEEK LATER, I AM HAVING TIRE PRESSURE PROBLEMS. THE TIRES IS SLIDING ON THE FREEWAY AND THE STREET. THE TIRE PRESSURE KEEPS GOING UP AND DOWN EVERYDAY. I BROUGHT THIS CAR TO THE DEALERSHIP TWICE, AND THEY SAID THAT NOTHING IS WRONG BUT SOMETHING IS WRONG WITH THE TIRES. LAST NIGHT, WHEN I PULL INTO A DRIVEWAY THE WHEEL WAS STRUCK UNTIL IT STOP. THIS CAR IS 2017 HYUNDAI SONATA SE. I NOTICED A DIFFERENCE WHEN YOU CHANGE TIRES BECAUSE THE TIRES ISN'T SLIDING ON THE FREEWAY AND THE STREET.