No its not BS think about it, you're too idle for a long time you will lose your download and other people do not stay online to allow you to finish it if its a long dl, thats just because you have stayed idle for too long while in Limewire. Without any browser activity you could even lose your connection to Limewire. When that happens its best to reboot and log in fresh to try to resume your download.

edited to add: what patch and what version?