Me too my Sonata's been a pos.
I drive 98% highway,air bag computer,rust,e brakes kept seizing up (i use them every day),dash gauges replaced,valve cover gasket, fuel pump gasket,lots of squeaks and rattles, the engines got a weird rattle on deceleration (sounds like valves or timing chain) they seem think it's normal and say its the gdi, its not. I also have a vibration that comes and goes even with cruise set but guess theres enough speed variances for that to occur but I've had wheels,tires etc checked rebalanced etc. Most insulting thing I was offered -11,000 $ trade bye dealer with 74,000 kms on my car.
I have been driving Hyundai's since my 1985 Pony but this is my last I think.