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Considered posting sooner with my own experience, but after finding resolution to what were precisely the same issues as others in this thread describe (and many other places online place, of course), wanted to wait until my confidence with a Surface Book was strong enough to warrant posting. To be clear, the issues I encountered on a SB purchased from a MS Store on May 1st were the crashes during Sleep and/or Hibernate, rendering the last desktop state completely lost.
The problems I experienced were not a surprise as I had been following this thread, among others, detailing SB woes well before purchase. Having had largely great experiences with the SP1 and SP3 for IT field work, I was willing to give the SB a shot with the clear intent of promptly returning should troubleshooting and/or near-future updates fail. They did fail, but because MS updates the base image on products (at least the current Surface lineup, to my knowledge) coming off the assembly line as firmware and some software updates are pushed, thought that a replacement that could be verified as 'fresh' from the factory would be a last attempt at enjoying the SB for the machine we all hoped it to be. Reached this decision after tracing my original SB's serial number to a surprisingly old (in tech terms, at least, considering the May 2016 purchase) production date–mid-December, 2015.
I'll mention I have a good relationship–but no direct/professional affiliations–with the local MS store via previous visits, which helped things move along expediently with a no-hassle exchange for a new (really new) SB. I was able to give a comprehensive rundown of findings in the Event Viewer, crash logs, hotfixes applied, image updates, etc. without needing to endure a wait while in-store techs do the same testing and hotfixes to no avail. Although there are some hotfixes that come out only for application within a MS store, I avoided that option by bringing up the early manufacture date which seemed to be subtly acknowledged as better reason to do a direct trade for a newly manufactured SB. MS Store employees are mostly forbidden to speak about much in the way of product defects, but I felt confident there were strong indirect signs that things had improved on late-models. Whether improvements might extend beyond a clean updated base image I don't know, but it was enough motivation to give a try.
It's been nearly a month since then and have had ZERO "Sleep of Death" issues; Sleep and Hibernate function just as you would expect. There have a been a few minor hiccups in other areas (e.g. Surface Dock stability) but most seem to have been resolved with recent updates...knock on wood. For reference, my current SB was built late-April. I realize this potential solution may not be possible for everyone, but for those still searching for solution, that's my experience. Wish all success in finding satisfaction with a SB, certainly happy to have personally found some.