Winamp is disconnected after a few minutes of streaming.
Some older versions of the Nullsoft SHOUTcast Source DPS plugin have a bug that will cause disconnection after streaming for a certain period of time. This can be fixed by updating to the latest version of the plugin.
The current version as of writing (11th July 2013) is 2.3.2 which can be downloaded here:
http://download.nullsoft.com/shoutcast/tools/shoutcast-dsp-2-3-2-windows.exe