Like many others, my 11" iPad Pro (ordered at launch) has been suffering from an intermittent unresponsive screen. I don't know when it started, but it wasn't always that way. I'm currently running the latest version of iOS (12.3.1). I had tried restarting several times but somehow it never occurred to me to try "force restarting" until earlier today. The way to do this is: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Press and hold the Top button until the device restarts. This seems to have fixed the issue for me and now the screen is very responsive. Hopefully this solution works for others as it is a very frustrating issue.