SBS 2011, DHCP issues, and hard reboots

I have an SBS 2011 server handling traffic for around 25 workstations. Over the last three weeks, the clients have been complaining of not being able to get online when they start in the morning. The only way they have been able to "fix" the issue is to hard reboot the server. When they attempt to log in to the server, it will log in and then lock up almost immediately. I have asked them to disconnect the NIC, give thirty seconds and then hard reboot. This allows me a reference point in the logs, because I get the following message when they unplug: "The DHCP service is not servicing any DHCPv4 clients because none of the active network interfaces have statically configured IPv4 addresses, or there are no active interfaces."

Running BPA reports no errors. I am not seeing any obvious errors in the logs for why DHCP would stop serving addresses. When I look at the workstation, the ip address given is 169.254.x.x. I try to do a /release and /renew, and it says the dhcp server timed out. I am unable to restart just the DHCP service on the server, because it locks up.
Computer HelperWindows Server AdminAsked:
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pjamCommented:
Have you disabled power management in the NICs?  see below:
Power Mgt
Computer HelperWindows Server AdminAuthor Commented:
Power management was not disabled. Went ahead and disabled. Will continue to test and see if that fixes the issue.
pjamCommented:
You have to wonder why something like that would be in config anyway.
Hopefully that was reason for lack of response.
Do you have any errors in event Viewer that might be a clue?
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Computer HelperWindows Server AdminAuthor Commented:
Every hour, at the 34 minute mark, I get an error from the DHCP server with the same error listed above. This has not happened since I made the change.
Cris HannaSr IT Support EngineerCommented:
Have you by chance disabled IPV6
Computer HelperWindows Server AdminAuthor Commented:
Everything was working great until this morning. Last night, during routine maintenance of the server, I restarted to install updates. Did not attempt to log back in after I restarted. This morning I recieved a call saying they had the same issue. Went on-site and discovered that I could not log on to the server. When I press CTRL + ALT + DEL, I get just a blank screen. I've attached an image, Server Frozen with what I was seeing. I manually reset the server, logged back in, but again can see nothing out of place. No DHCP errors this time, so it might be a separate issue.

When I run the BPA, I get two warnings, exchange SP3 is out, and drives are low on free space. I have 80Gbs of free space on the main drive, so not too worried about that. I checked to see if IPv6 was disabled and it was not. It shouldn't be hurting anything, as SBS2008 and up have full support for IPv6. Do I need to disable it?
In the "System" log, there is a gap from 5:28AM, where WinHTTP Web Proxy entered the stopped state and 9:37:50, System start time. I can see the system rebooted after updates at 1:12:08AM. What happened between 1:12 and 5:28, not sure.
Cris HannaSr IT Support EngineerCommented:
No, you do not to disable IPv6 and should not disable
i'd have to do quite a bit of research, but if you don't have Exchange SP3, sounds like you could be behind on many patches which might improve stability

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