This issue has been going on for several months. We are running a domain network on a SBS 2011. The workstation in question is running Windows 8.1 pro with all Microsoft updates installed.
After booting up the workstation we are able to remote into it for about an hour. Then RDP is unable to connect, connection fails before we are prompted for user credentials.
Remote access is enable.
Windows firewall is allowing remote desktop connection.
Symantec endpoint protection has been removed.