I had the same problems a few months ago. I replaced the thermostat temperature sensor housing, drained the fluid going to it, put in new fluid, and after an hour it should go back to normal,
I have this message keeps popping up every time on my truck every time I turn it on when plugging my phone, I've tried using other phones when plugging it in and it still pops up.
Go to infotainment.com its 2 grand, but you get the bigger screen, apple CarPlay, free Sirius xm (it's not a trial), free weather (again it's not a trial), that also has a radar, free factory navigation (not a trial), I got mine from them and it's, from a 2017 Silverado