thehungrygoat wrote:
I held out hope that this issue may be fixed with iOS 11, but a few moments after updating a moment ago the problem still remains.
A software update cannot fix a hardware problem. If the screen keeps blanking out, or as in your case won't come on except after a period of time, then you have a screen issue. Make an appointment at the Genius Bar of the nearest Apple Store to have the device examined. They will explain your options from there.