Check with your ISP. For security reasons, some ISP's will time out after a certain length of time. This happended to me with a former ISP. Their limit was four hours and I had a download that required five plus hours. That was one of many reasons I switched to DSL.
Let us know what you find.
Whenever I try to download a large download(RTCW Enemy territory and map pack)an error message comes up stating the connection timed out. HELP