 About a month after purchasing my new 2012 Sorento Ex with the optional V6 engine I noticed a loud thud almost everytime I started up my suv. I brought the vehicle into the local Kia dealership and they did some updates to the Sorento's computer which did get rid the problem. Also, my Bluetooth doesn't work so I cannot use my samsung phone in the vehicle. Flash forward one year and now I'm experiencing a noticeable lag in acceleration. I told the Kia service manager about the problem and he said to add a bottle of gas treatment. Did that and the problem still exists.I'll be trading in my Kia soon for a more reliable vehicle.