Shifting
since yesterday, when I drive my car sometimes it doesn't want to change the speed, but when I put back to the P and go back to D the car start shifting normally, I thought that was the transmission, I bring the car to the dealership , they did all the tests for the transmission and some sensor they told me they didn't find anything wrong with the transmission and something else, but the problem still coming back sometimes, I really don't know what to do, thanks for your help
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