It could be something as simple as a software tweek, for the charging system-when I got my Benz, i had a similar problem--took the tech several tries to remedy it--car would go completely dead and with an electronic shifter , the car is locked in park until voltage is applied
Also, check a fuse in the engine compartment marked "DOME"--remove it and see if the parasitic drain disappears--this is for the RAV4
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