That might be the case Peerless. Bandwidth limiting by the packet would allow a certain size of data to transfer (like 32 or 128 K) but drop the rest. The application still wants to send the remaining data so it tries again, gets a few more packets across and continues with this cycle.

It sounds like you're saying only some of the uploaders are cutting out -- meaning their downloading bandwidth is saturated and causing the same problem I'm having but in the other direction. My downloads don't cut out repeatedly but they just go slow.