Looks like some major issues with the iPad Pro
"iPad Pro owners across the world have been reporting a serious bug that appears to affect all models of the device. Users have taken to the Apple Support Communities forum, saying that after charging their iPad Pros overnight, or for a number hours, they return to find the device unresponsive and the screen completely black."
http://www.neowin.net/news/ipad-pro-users-report-freezing-after-charging
"iPad Pro owners across the world have been reporting a serious bug that appears to affect all models of the device. Users have taken to the Apple Support Communities forum, saying that after charging their iPad Pros overnight, or for a number hours, they return to find the device unresponsive and the screen completely black."
http://www.neowin.net/news/ipad-pro-users-report-freezing-after-charging