Do you have the green caps on your tires? I was told that the green caps mean that you have nitrogen in your tires. If you offset them with air from a gas station, it mixes with the nitrogen and causes problems.
My first Hyundai had the green caps and I added air when the light came on and kept having problems. At service the told he about mixing the air. My new Hyundai has plain caps and I have not had a problem.
Z
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