@carnau a simple Google search with show you how many people have had this exact same problem, its a lot of people. Unfortunately it's mostly intermittent and when taken in the dealership cant spend enough time driving the vehicle around to experience it, probably why you havent heard about it.
GM probably wont do anything about it until people are dead, I have lost a lot of respect for GM since purchasing my 2017 silverado 1500 doing the exact same thing as mentioned by the original poster.