Mac rebooting into OSX instead of windows after unexpected shutdown

Got a bit of a strange issue here.
I've set a mac mini that is running windows server software to always boot into the windows partition through "startup disk" in sys prefs. It does this just fine when properly shut down or restarted, but always boots back into OSX if the power down is unexpected. Of course, one might say, well hold down the "option" key when it restarts and choose where you want to boot to, but this machine will often be left unattended, and it NEEDS to go right back into Windows if that happens.
Your thoughts?

You are right, S3 mode for sleep seems to have changed with Windows 7 SP1
SSD seems to be linked to having problem for some
Some go back to pre-SP1
It would probably take a while to find a fix, after someone knows what and how it happened and can be tested.
The likelihood of BIOS update on PC is real, happening on a Mac with EFI and / or SMC firmwware updates highly unlikely.
It is annoying. I thought it was a bad cable or wire, swapped out my PSU for a larger one I had sitting around. Moved Windows off SSD RAID to mechanical drive. I was beginning to think my motherboard was at fault, because two other systems, a Mac Pro running 7 SP1 and PC, both using single SSD for OS, do not exhabit any problem with sleep modes, even if I let it go longer.
Disable or uninstall.

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Hi,
According to your description, it seems like driver problem, especially Graphic driver, you can try to reinstall and upgrade Graphic driver to be latest to test this problem.
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OS Version:                                          6.1.7600.2.0.0.768.3
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Read our privacy statement online:
http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409
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C:\Windows\system32\en-US\erofflps.txt
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"It's not a true crash, in the sense that the Blue Screen was initiated only because the combination of video driver and video hardware was being unresponsive, and not because of any synchronous processing exception".
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Mac rebooting into OSX instead of windows after unexpected shutdown

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