I was having that exact same problem, was using firefox and was letting it download overnight when i would have the best bandwidth. and in the morning i would get that same message. im not exactly sure what was causing it, as the downloads would work perfect on my wifes come, but not mine. the wifes computer died and i built her a new one wich also has no problems downloading.
as an experiment i started a download durring the day and made sure i was around at about the same time the downloads stopped previously. strangly enough i caught my router resetting... tried again on wifes comp, same router, same port on router, no problems. SO all in all i have no idea why it was happening, but now i knew what was happening... my guess is a setting on my comp somewhere.
God is not omnipotent, as he cannot create a wall that he cannot destroy.
