Had the same problem first when starting my 2019 6.2 Sierra. Found the mouse to come back when the starter engages after starting from stopped at a light. I hate that feature too, wish there was a way to turn that feature off for good instead of hitting the button each time I drive it. Took the truck to the dealer for the squeaky belt, they did replace a belt, however the sound is still there. Hopefully they can figure this out.