What i have understand is that at the end of a file windows slow's your system douwn by unconnect whit the seeders you have same as whit the start you start whit one than up up up until you have a high speed douwnload this happens also at the end douwn douwn douwn and than it happens bam it stops
i cant tell you the solution but i had the same problem before and found the solution in one of the bitcomment pages in the forums so loo there and if you find it maybe its wise to post it here on your blog so more people can benefit out of it
if you can't find it maybe fendyBt2 knows the solution he is a wizkid on bitcomment
hope it helps mate