Confirming that my SB crashed overnight while in Sleep, after successfully installing the May 9 updates. Same Event error as before: Unexpected Shutdown. Kernel-Power error.
I was hopeful that the latest update addressed the issue but as we now know it did not.
I have had some recent email dialogue with a Microsoft support representative, providing her with my Sleep-Crash (Sleep of Death) information, copies of my Event log and pointed her to a few of the (many) threads here on the Sleep issue. Except for a polite thank you for the information there has been no further follow up or response in about a week. MS knows about this issue, that's for certain. In my opinion it is either a difficult problem for MS to solve in firmware or is an unsolvable hardware issue that will persist.
I really do believe this issue is not necessarily Microsoft's, but Intel's new power-dripping sleep state on the skylake chips. Other newer laptops that use the same skylake chips are also having sleep issues.
I have not yet been able to confirm that I still have the sleep crashes since I just installed the 5/9 updates this afternoon, but I'd be surprised at this point to see them go. Amusingly, rather than my Surface Book being completely off this morning, it was once again far too warm while sleeping. It seems I have one situation or the other -- sleeping, but hot/warm and clearly misbehaving, or completely off.