Very hard to diagnose on their behalf with no error code to guide them for starters.
I'm with the thinking it's a technically glitch, And with a simple reset/restart it usually goes away.
I would figure it's something to do with either oil temp sensor telling the ecu go into limp mode or the ecu maybe causing the issue.
Sorry to hear she's spending the night at the dealers, But IF they can replicate it?
They should figure it out. :keepingfingerscrossed:
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