Limewire Waking Up?

Can someone please tell me why limewire goes to sleep? I leave my computer for 20 mins er so leaving limewire on to download a file, when i come back It will have a "fair" connection, it will also say "Waking Up" in the connection status and it wont finish my download. then takes like 10 mins to get a "TurboCharged" connection again. How do i turn that off? its irritating because i have dialup if i have to sit there and watch the file download to make sure lime wire wont fall asleep on me i will go insaine