iPhone 6 Plus Screen Backlight Issue

I've noticed an issue I've been having with my iPhone 6 Plus a couple weeks ago. After the phone has been in my pocket for an indeterminate amount of time, I would randomly be unable to light the screen back up. The phone would come out of sleep, I could swipe to unlock (or use Voice Over) and I could see the backlight come on. The problem was the screen itself was just black - nothing to show. Rebooting sometimes fixed this. It was especially annoying when trying to board a plane and then being unable to bring up the boarding pass.

I noticed this week that I could produce a similar behavior more regularly. I needed something I could reliably reproduce before bringing it into an Apple Store. Here it is:

[wpvideo DQmniYFQ]

Hopefully they can repair or replace the device. I made the mistake of going with a regional carrier (US Cellular) and in the past I heard you had to arrange repair through the carrier. I'm hoping its just a screen replacement and they can do it in-store.