Well my 2012 QX56 loaded with all options is having the same problem. Loss if power and barely gets over 40mph. I have a bumper to bumper warranty covered by GM. They've actually been great but seems they're tired of Infinitis shit too. First visit was ecu, less then a week later 2nd visit wire harness, warranty covers but asks Infinitis to thoroughly inspect all connections and assure no other problems.. exist. Driving home from dealer car has the same symptoms. They say another wire harness. GM warranty says this isn't an open check book and wants dealer to split costs. My car has been in the shop for over 2 months. They gave me a loaner but I'll like to have my car fixed correctly. I had a 2010 Toyota Sequoia Platinum before this turd. Never had a problem with the Toyota. I'll be going back as soon as Infiniti can figure it out.