Probably just a normal streamyx slowdown. These trackers are http, so you should get timed out pages also when you surf the internet.

The easiest way with the default utorrent configuration is to turn on UPnP on your router. To check, goto the logger tab in utorrent and see if the mapping is successful.

The harder way is to manually forward a port to the ip address of your pc in your router's setup. Yes, you would need a fixed ip for both cases. Either set the ip manually in your windows configuration or check what ip the router's dhcp has assigned you by looking in the support tab of your connection in windows.