It’s just the modern version of pumping the gas a little bit to get a start! Jokes aside at least a reboot fixes it and you don’t need a new carburetor or something.
Yes, it’s scary the first time it happens. I had to do this once early in my ownership when I got into my Gravity and all screens remained off. I called roadside service who instructed me to do the hard reboot; it was my first hard reboot experience.
The good news is that it doesn’t happen often and it’s less scary the second time . My drive stalk was non-responsive after I got into the car and a hard reboot fixed it. I didn’t bat an eye.