Recently, one of our Hyper-V virtual machines has periodically stopped responding over the network. It seems to be happening every few days, and it occasionally happens up to several times a day. I am by no means a sysadmin, so any direction you guys could provide would be very welcome. I've included everything I know to include below. If you need any additional information, I'll be glad to include it.

• I can connect through the Hyper-V console.
• I can't connect to network shares, IIS web apps, using RDP, or using ping.
• Memory usage seems to be normal (3 of 4 GB)
• Processor usage seems low.

• We don't know the exact time the server goes down, but the following error appears consistently around the time it goes down:

  Error 5719, NETLOGON
  This computer was not able to set up as secure session with a domain controller in domain *** due to the following: There are currently no logon servers available to service the logon request. This may lead to authentication problems. Make sure that this computer is connected to the network. If this problem persists, please contact your domain administrator.