Engine Revs high going up or down slight hills

SeCX-9

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2016 Mazda CX-9 Signature
My wife's 09 CX-7 GT has an issue with the engine revving really high when going up or down hills. Only happens sporadically. She has to tap on the accelerator to kick it out of this mode. The car doesn't accelerate, but it revs really loud and is very worrisome.

Just brought it into the dealer to have it checked out and since it's not easily reproducible, I'm hoping someone else has had a similar problem.

Anyone?
 

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