This is just a guess, but I suggest your ISP has a ten minute "idle cut-off". You should be able to read about it in their Terms and Conditions, usually available via their Home page. Most ISPs impose something similar, the ISP I use has a 20 minute idle cut. If your modem is not actually "talking" to the server, then it is deemed to be idle, and is disconnected after the specified period, to reduce the load. There are some ways to "beat the system", but beware, it might be seen as abuse by your ISP, and subsequent disconnection could be rather more permanent!
[ 07 September 2001: Message edited by: spekesoftly ]