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I don't think I've ever had it downshift from 2nd to 1st at 2000rpm.
I know this might sound ridiculous, but could it be a low battery? I know the computer tries to balance fuel economy when charging the battery and can end up undercharging out doing some weird things while charging. The hard downshift could be some attempt at a fuel efficient way to urgently charge up the battery.
Try charging the battery fully and see if the issue comes back.
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