This is a known problem with the older VIA chipset and the Alcatel modem which apparently draws too much power. The only way I have seen this fixed is changing the mainboard to a non VIA chipset one (this was after changing to a powered USB hub and installing a non-VIA chipset PCI USB card). I am not sure whether changing the modem would help (to a Westell one?) perhaps that is something you should ask BT. I predict that this will be a major problem as more people to to broadband.