O hotfix associado ao KB2897602 , "conexões TCP que usam endereços de loopback efêmeros são descartados repentinamente no Windows", corrigiu meus problemas de congelamento do cliente Windows 8 RDP.
Symptoms
You run an application that connects remotely by using a TCP connection on a computer that's running Windows 8, Windows 8.1, Windows Server 2012, or Windows Server 2012 R2. If the TCP connection uses ephemeral (short-lived) loopback addresses, the connection may be dropped suddenly after 40 to 50 seconds. However, the TCP connection is still "live" from the client side. In this situation, the application does not maintain the remote connection.