My car used to do that. Here's how I could reproduce it every time:
Park the car and let it sit for at least 8 minutes (long enough for the computer to go to sleep).
Then, launch the mobile app, wait for the app to connect to the car, then open the car door.
Blank screen every time on my car.
The service center ended up replacing my screen and I've never had the problem since.
p.s. if the mobile app connects quickly then the computer wasn't sleeping and you won't get the blank screen.