SurfaceBook Crashes/Shutdowns During Sleep

I've had the same problem(s). Even after DSIM repairs and rebuilding the machine from scratch so to speak, same problems. I agree the Surface Book is not ready as is, it has far too many nagging issues. I've had issues with the following:

1. Surface Book crashing while asleep.
2. roughly 20-30% of the time crashing after reattching the Surface Book (Internal_Power_Failure).
3. dll files corrupted with my Nvidia GPU  (yes, even after refreshing my machine).
4. Both USB ports seeming to have power issues (2 mice, multiple external hard drives and my headset randomly shutting off or experiencing an issue as though the port is overloaded) on TWO seperate Surface Books. This could also be some kind of driver issue but I don't know forsure, it's been a complete mess. 
5. I've even had Windows Store pop up with windows store error 0x80073cf9 before and after refreshing the machine lol.

Should I return it my second Surface Book? Probably. Out of all the issues however, it still seems shocking that there are so many problems putting this machine to sleep successfully.

I get the same error as you, I was thinking on going through the painful process of reimage, DISM, etc., but I think now after all the feedback, I will just return it. I think the SB still requires a lot of tuning at the SW and probably HW level, to make it a reliable and stable platform. It's a great device and I like it a lot, but to me it's green, not ready for prime time, I cannot afford all the number of unexpected issues on my main working device, I need something more reliable, I might have to accept a trade off in functionality and capabilities (iPad Pro) for stability and predictability.

Are you sure the problem will not happened while hibernating? do you use hibernation only when the SB will not be used for long periods of time or anytime? if is it anytime, that's pretty bad, because during the day I need the capability to quickly turn on the device, check for an email and then back to sleep again.

It's really some kind of a joke that having the "latest Skylake" technology and the latest and "best Windows OS" we have to deal with all these basic issues.

I have experienced sleep crashes both plugged in and unplugged, tho most often when plugged in for me. It is not the hand off to hibernation that causes it, as my machine is set to never hibernate when plugged in, so there's no reason it should be even trying to enter that state when I experience the most sleep crashes.

I wouldn't be surprised if the cause is legacy applications, but I do have to say, I leave NOTHING running on my SB when I put it to sleep other than what always runs in the background. I do not use or have iTunes on my machine.

My sleep crashes also seem somewhat random -- that is, I don't get them with any consistency, and I've yet to notice a distinct pattern (particular applications that were used prior to the sleep session that caused the crash, particular errors in the logs prior to the crash, etc). It can be days without a crash and then one day, I'll have it happen every time it sleeps. It's just so frustratingly random.

I built a small form factor desktop a few months ago after I realized I just couldn't rely on my SB for all my computing needs (too unstable) -- with a skylake chip. Amusingly: no sleep, no hibernate... and no issues.

Back to all-hibernate for my SB for now ...

This is a well known and often observed issue. You will see numerous posts on this forum for the "Sleep / Crash" issue. It generally takes a few hours in Sleep before the SB crashes. I have yet to find a solution and have tried all the "fixes" offered on this and other forums (reimage the SB, DISM repair, disable Fast Start, disable connected standby, etc.). In my case the Event Viewer logs the following error:

"Event ID 41, Kernel-Power, The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."