2008r2 w Hyper-V shuts down and restarts Intel Board 5520HTC and 5620 processor

HELP!!

We have a custom built 2008r2 with 24gb ram, 1 5620 processor on a 5520HTC board with Hyper-V.   We have frequent reboots (up to 10 a day)  I've seen issues with hyper-v and the 5500 series processors, but doesn't look like it applies here.  This does have Speedstep enabled and the power management was balanced.    I do hear 3 beeps when the server boots, but everything seems fine.  

I've been reading KB's etc on similar problems but no real solution.  I do notice it happens overnight alot when the server is basically idle.   Should I change the balanced power settings??   Is their a permanent fix to this?   I see a hyper-v fix for westmere, but it says it doesn't apply here.

THOUGHTS?
anderdw2Asked:
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kevinhsiehCommented:
Hmmm, I would start by applying SP1. I would also check to see if there is an updated BIOS.
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anderdw2Author Commented:
I'm on bios 49 which appears to be the latest.  SP1 is installed

I changed the power last night to performance and not balanced.  I also installed the latest chipset drivers... so far so good.
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anderdw2Author Commented:
The only thing i came up with, updates all the drivers and applied the power settings, so far no crashes.    Not sure exactly what the problem was, but I see a stop error for hyper-v for westmere processors, but it doesn't allow me to install.
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Windows Server 2008

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