I've built a application that communicates with Coldfusion cfc functions via Remoting. I've noticed that the NetConnection object disconnects after each call, is this expected behaviour? For some reason I was expecting the NetConnection object to stay connected until I closed it myself (I'm making about 1 request per second and had planned for it to stay open).
If you're using an HTTP connection, it will not be persistent, but if you're using RTMP, it should be persistent. Check the connected property.
http://livedocs.adobe.com/flex/3/langref/flash/net/NetConnection.html#connected
If you're using RTMP, I'd check to see if the server side code is terminating the connection.