I have 2020 Silverado with the trailering app and *exact* same thing is happening for me since delivery. When screen is blank, have to shut off truck, open driver's door, and leave truck off for 15+ mins to reset. There is a TSB out that says to reset Infotainment System to factory default, and show customer how to do this in case it happens again. I've had service 3 times for this where different software was reloaded, but no improvement. Dealership tech even opened a tech case with Chevy, but response was to reset to default. I opened a customer case and was told to try a different dealership, no improvement with their help either. Bottom line, I was told it is a software anomaly and there will probably never be a fix.