This has been an ongoing issue for our Surface Book 2's for the past few years. There isn't really one specific pattern I can pinpoint but here and there say if a user is working on their laptop, closes it up to bring to a meeting and goes to open it, sometimes the keyboard lights will still be on and active but nothing will display on the screen. No CTRL ALT DEL or anything will get the display back. We end up having to hold down the power button until Its fully powered off (you'll know once the keyboard lights go off) and turn back on. I've tested all different kind of power settings. Having all sleep and hibernation fully off (whether on battery or charging). I've yet to really find anyone having a solution to this.