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Thanks for posting,
The dealer doesn't know what's wrong but they want to buy it from you for $800. Has anybody checked the 12 volt battery in the trunk? If the dealer did a complete diagnostic inspection they should have found some diagnostic information, I think that if you want to keep the car you should have a diagnostic check and get another opinion. If it needs an inverter, hybrid battery or a computer then it may not be worth keeping.
Did they tell you what might be wrong, did they check the 12 volt battery?
That doesn't sound right at all, they charged you $1400 and didn't tell you why or exactly what they did to charge that much money, the car is not even worth that.
That's rididculus, you can't do that everytime you use the car, not sure what the problem is either not having access to your car so I could do some tests myself, it sounds to me like one of the computers may be the problem it may reset by disconnecting the battery, not sure how I can help other than what I've told you so far