Join Date: May 2014
Location: N. Central Florida
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This sounds to me like a case of you and the dealer both overlooking the obvious:
A 12 V battery going bad.......or a loose or corroded main 12 V connection at or near the battery.
The 12 V system runs ALL of the computer controls and the symptoms sound very much like yours is not holding a charge very long once the car is shut off.
'17 Prius C-4