Diminishing bandwidth??

G'day to all,
I've seen numerous posts about ppl having issues with downloads but I don't think I've seen one addressing the issue I have. When I start downloading a DS rom, I get a good speed at the start anywhere between 144kbps - 160kbps. Once the download reaches about 50% completition, the speed drops away dramatically to30kbps - 43kbps. I'm only downloading one rom at a time without any d/l managers. Is this a fault or is this a way to save your bandwidth? Just a tad confused why the download starts off strong then whittles away to nothing.Can someone please help?

Supply and demand, we are able to supply x amount of MB/sec, sometimes a lot of users are downloading and other times not so many users are downloading. We do not limit download speeds at this time.Oh and you can use download managers now if you prefer, the system supports them.