Add me to the list. Same thing. I have noticed it after starting from the GMC App as well, but I don't think I've started my vehicle any other way as it is the winter season here. The first time I had it programmed (for the recall fix) I drove it, started/stopped the engine at least 3-4 times, and didn't experience the symptom until the next day. I had the dealer tow it and reflash it. They drove it for two hours and didn't have an issue. I started/stopped it 2-3 more times then when I went to leave back to my office from lunch I got the same messages. Brake pressure is terrible, but restarting the truck one time leaves the check engine light on and the pressure seems to have returned to normal but I'm not confident to drive it.
I'm wishing I hadn't got the recall done...