Lost of power

Hello, for something like this you are really going to need to have a good relationship with your dealership. The dealership can check everything and run every test needed and I would imagine you still have the basic 4 year / 50,000 mile warranty in effect on this vehicle. They are in the best result to figure it all out. The biggest road block for a dealership technician or anywhere else is to duplicate the concern so as to know what's happening and know if it's resolved once a repair attempt has been made.