Air Conditioner problems of the 2008 Cadillac CTS

The car has had 7 batteries replaced. It has been towed three times to two different dealships. When the failure occures the door lock, the engine will not start, lights will not work, the car is completly dead. The last time my wife went one mile and the lights,radio, air conditioning and doors locked and would not open. She could not get the key out of the ignition. The door was opened and the car sat for two hours. When she went back to the car everything worked like nothing happened. She drove home and the next morning the battery was dead. It was towed to the dealership and the oder of burning wiring was obvious. One week later the dealer service department called to inform me that the fuse block was replaced and the radio caused the problem. The car was leased and I just returned it with 17,890 miles. We went out and purchased another car when they said the wiring and fuse block was burnt. We just let it sit in the driveway until the lease run out.