Remmina remote desktop RDP randomly logs off

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http://askubuntu.com – I am using the Remmina remote desktop connection on Ubuntu 12.04 to create RDP connection. The system on the remote desktop is Windows Server 2003 RC Standard 64 edition which logs off by itself randomly. It terminates the connection, so you have to re-connect. For example: Terminates when I want to switch to another application or simply change the desktop. On another PC (which is running on Windows) this problem does not occur. Does the Remmina have timeout or logoff settings which can cause this problem? What could be the solution? (HowTos)