Try this and if it does not work call in for a replacement as it has a 2 year warranty.
D Link post link
http://www.cableforum.co.uk/board/34916465-post3.html
You need to call Tech Support which is open 24/7 on 151 from your Virgin Media Phone.
It's absolutely free.
Or call 0845 454 1111 from any other phone line.