SBS2011 Server slows down, then back to normal?

I've got an SBS2011 server that randomly for about 10-15 minutes will slow to a crawl and I cannot even log in during that time. Users can't access the shares or any other resources on the server. Then after that time period will be back to normal. This happened a couple months ago and was getting so bad it was happening every other day. Finally after a reboot it was fine for about 40 days.

Now today (40 or so  days later) I had the same issue twice. I ended up rebooting and it's been fine so far.

I don't see any correlation between this issue and anything in the event logs.  The machine only has about 3-10% CPU usage at any given time. And it's got 32GB memory and typical usage goes from 40% up to 66% usage.

I thought it was some sort of memory issue or pagefile issue but I'm not really sure.

Also, even though this is SBS we aren't using Exchange, all those services are disabled.
It's also mostly up to date with patches and such.

I'm just not sure what else I should be looking into here, so any help would be greatly appreciated.
JoshSystems AdministratorAsked:
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Make sure the SQL/WID instance for WSUS is limited to 2GB to 4GB at most.

Limit the Store.EXE (Exchange) cache memory (Third Tier has a post on this).

A/V client on the server? I suggest dropping that unless there are compliance reasons for having it there. We don't run A/V on servers unless required to do so. It's useless there.
Alan HardistyCo-OwnerCommented:
Disable Power Settings on the NIC for the server.

To do this, click on Start and type 'NCPA.CPL', then right-click the NIC properties, then on the Configure Button, then on the Power Tab and disable the Power Save 'Features', which is on by default on every Windows Computer (which is a royal pain in the arse).

Also worth checking with the Server / NIC Manufacturer to see if you have the latest Drivers / Firmware for the NIC and if they are out of date, get busy updating them.

JoshSystems AdministratorAuthor Commented:
It looks to be an issue with SQL. I ended up allocating less memory for that.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Um, what about my answer?
JoshSystems AdministratorAuthor Commented:
I apologize. Your recommendation on SQL pointed me in the right direction.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
No worries. It happens! ;)
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