We purchased the car in november 11, 2013 and the problems started shortly thereafter. we have extensive paperwork over the course of 4 years that confirms the numerous times we've unsuccessfully attempted to get infiniti to solve the problems. at one point, infiniti supposedly fixed the problem by completely changing out the software but the problems returned. in fact, every single time we brought the car to infiniti, even if it was just for an oil change or routine service, we informed the dealership that the car wasn't functioning correctly. we have put only 37,000 miles on the car and we've taken very good care of it, performed every scheduled oil change, use only premium gas, etc. from almost as soon as we took possession, we begin experiencing severe issues: "high revving when idling "lag/hesitation when accelerating from a dead stop "high revving when applying the brakes. we were told to not drive the car in sport mode with the air condition running. "transmission has needed software updates "extremely loud sounds from the engine "juddering, almost stalling because engine is not getting a steady supply of air, fuel or power "fuel tank is slow to fill and filling nozzle shuts off before tank is full "much lower mileage than promised - no better than a conventional engine car regardless of whether it is economy, regular or sport mode "braking issues. told to not drive in a lower gear going down the steep hills as the braking actually charged the hybrid motor even though it caused our brakes to wear out prematurely. given the litany of unrepairable problems that render this car unsafe to drive with my kids, i thought the nhtsa would like to be made aware in the event there are other consumers with similar problems. i've requested that infiniti initiate a repurchase for my qx60 hybrid based on my state's lemon law.