I will never buy Hyundai again
I bought as new and drove less than 30K on my 2015 Sonata.
So far I had 3 software recalls. 1 parking brake switch replacement (recall). Replaced Variable Charge Motor (VCM) after few incidents of engine about to stall - big vibration with no engine power at start. After 7 months, engine stalled in the middle of the street with loss of power. We could have big accident if it was on highway. Towed to dealer since car doesn't start anymore. Dealer replaced Accelerator Position Sensor. I am not sure if that fixed problem. I received letter from Hyundai saying my engine might have excessive connecting rod bearing damage, therefore giving me a extended warranty. My two friends, who drove 2013 Kia Optima, and 2014 Sonata had their engine completely replaced after experiencing similar problem as I did - Engine stalling after loss of power. I know my 2015 Sonata engine is almost same as theirs (Theta-II Engine).
I am still afraid to drive this car. Within my 32 years of driving many different cars, I never had this much serious issue with any car, specially at such a low miles.
I will never buy Hyundai again.