I frequently have downloads that are proceeding nicely (from a single host), then suddenly revert to "Waiting in line, position ?". I was just wondering what the reason might be. So far I've come up with:

1. A fluke of the download protocols
2. A setting on my system
3. A setting on the other user's system
4. A gremlin that roams the internet randomly causing disruptions

Any enlightenment you can give me would be appreciated.