I've started to feel really guilty!!!!

For some time now, I've noticed that uploads seem to come to a sudden and abrupt end.

For no apparent reason, the upload just freezes, still registering as uploading, but at 0Kb/S

I leave them for a while to give them a chance to continue, but then kill the upload after it's frozen for 15mins or so; after that, no further uploads.

I feel like I'm cheating or something, not giving back to the community!

What's going wrong???

Dave E.