I've got exactly the same problem with my wireless network, with a Voyager 1040 PCI adaptor, and a 2100 router. The PC is only 5 metres from the router, but unless the PC/router are set at a perfect angle to each other, the signal is very weak and the wireless connection drops periodically, which sometimes is solved by simply repairing the connection; other times it requires the PC to be restarted. Isn't the range of this BT network supposed to be 40 metres?!? As far as I know, there is no interference from other networks or electrical appliances.