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.