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I have had my 2018 ZL1 1 owner since January at 12k miles. I have since put 2k miles of lightly spirited back roads and road trips. The entire time I’ve had the car it always shifted smooth as butter every gear no matter the RPMs. Suddenly as of about 2 days ago, it is shifting roughly during low RPM/cruising speeds, and only while left in automatic mode. Manual shift causes no issues, and neither does WOT or aggressive driving. I’m thinking a trans tune issues or maybe needs a flush? I am at a loss as to what to do because I know it I take it to the dealer they will just tell me nothing is wrong. Am I just paranoid