I have the same problem and for me its really difficult because I have a 56k modem and itll take about 5 hours to download a 50mb file even more!! but I am not sure what causes it but I think its when the uptime is really high, sometimes their on the net for over 100 hours and when you download from that server then it will eventually time out or something like that, I actually would like to know too.Try to get files that have less uptime.