before, since downloading the latest update, leaving the app open, switching to Safari, the screen would temporarily (a second or so) go dark before refreshing and giving me the page it should.
This morning, same steps, Safari goes dark and stays dark. going to different pages - yahoo.com, watchprosite, network54 - the screen stays completely dark.
switching back to the app, I close it, then go back to Safari.
I shut down iPad (long press) and the bug hasn't reappeared again yet.
No other apps running in the background.