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My 8 speed auto has been doing this since spring of last year when it had around 2 - 3000 miles on it. Mostly when it is cold. The dealer had already taken care of the torque converter issue by this point and did a relearn on the transmission module. When I complained about this issue the dealer immediately thought that I was feeling the hill start assist (holds the brakes momentarily to keep the car from rolling back, even on automatic models). I told them that the hill start assist was not active when this issue was happening. They basically dismissed it and I haven't taken it back for this issue since. I'm just waiting for it to get worse or it finally fail before I take it back in. Good luck with GM customer assistance, the reps can sometimes be infuriating to deal with. Keep us posted on how it goes. These 8 speeds are trash, glad the 2019 + models will have 10 speeds. Wishful thinking, maybe if it does fail they'll just put a 10 speed in lol jk
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