Hi,
We had this same problem. Fortunately ours was only about six months old so was still under warranty. Unfortunately, many engineers on many visits could not fix it. This went on until after it was out of warranty and in the end (as we'd reported this after only six months) they finally replaced it as they could not fix it.
Sorry, not what you want to hear. We've had so many problems with the replacement as well that rather than keep fixing bits we're buying something different.
Gareth., December 2005