Hey, thanks for the responses. I think that the second idea that you mentioned: creating a DCHP reservation in the router did the job. I hope that it will manage this over the next few days. The first suggestion was the thing that absolutely refused to work.
All I wanted to do was to use Utorrent correctly and the UPnP thing did not work either. I tried to activate it in the router and I could not connect to any internet pages then.
Thanks again for everything! Hopefully this will do the job.