My brand new mac mini Mavericks server won't stay online more than about a day or so, and I can't figure out what is happening. I use it for my home network, and our various Macs around the house are registered to the Open Directory server on the Mini for login validation. It also handles TM backups, etc. For the past week or so, the Mini has been mysteriously becoming inaccessible even though it is still powered on. It doesn't happen right away, but usually after it has been powered on for about a day or so. I have the Sleep function set to 'Never,' so I don't think (?) that is the issue. It has a wired Ethernet connection to the network, so not a wifi issue either. It runs without a monitor and keyboard, so I can't easily tell what is causing it to hang up. So far, I have had to resort to holding down the power button to force it off and then restarting, at which point everything works fine again for another day or so until it decides to disappear again. Pretty frustrating. Any ideas on what I might try?