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I had a similar problem when I first got my car, my driver side mirror would suddenly change position, seemingly randomly.
I took it to service, they replaced the mirror and its all fine now.
You may have a hardware problem.
Another way to think about it:
Depending on how long you keep your car, you'll get much of the money back for the 85 in resale.
As you can see by the forum an 85KWH battery the top feature for most. Battery size is probably the one feature that will make the car difficult/easy to sell.