Help: a few hours after updating an iPhone 8 Over The Air to 12.2, the screen flashed to solid rows of color bars, which wouldn't go away. Seconds later, the screen turned off. The phone was still on, though, as the capacitive home button was responding and the charge tone was sounding when I plugged the phone in a charger. Rebooting it didn't turn the screen on, nor did plugging into iTunes with Recovery Mode with a full 12.2 Update nor a Restore. The phone is a year old and I was never rough with it. I've scheduled a Genius Bar appointment today, but I'm willing to hear your input.