I have a 2015 yukon slt since I had the transfer case recall completed. Now when I am driving a "Service 4 wheel drive " error comes on and my vehicle shuts off on its own I have to wait 5 min before I can start it again this logs no codes for the dealership and it's happening often 4 times in the last 1000km. I worry about my family's safety and I am getting nowhere with the dealer does anyone have any ideas. Thanks