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Sounds like the ECM received a bad signal or no signal from one of the sensors and went into fail safe (limp home) mode. It could have been a one time glitch, a loose connection on a wire or a sensor failure.

I would watch it and it it doesn't happen again then write it up as a one time glitch.

The other possibility is that the PPS hung up and did not move with the pulley so the ECM though the CVT was in one ratio when it was in another. If you want to check something you can pull the PPS out and ensure it is moving through it's full range smoothly. It's not a hard job to do.
 
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