Mine just started doing the same thing. I tap the top button to wake it from hibernation, it shows Surface and the spinning dots for 2 seconds, then the screen goes black and nothing works. I have to hold the top button for about 10 seconds to force a power down, wait about 30 seconds and power it up.
I wondered if there is a problem with the hibernation file. I opened the Command Prompt(Admin) and did chkdsk c: /offlinescanandfix (schedule and restart to let it run the chkdsk) to see if that could correct a possibly corrupt file. The SP3 has not done it since, but it was not a common occurrence anyway.