I had the voyager 205 had nothing but trouble with it ended up getting a belkin wireless router never looked back.A problem I did have was the length of the adsl lead from the wall socket to the router one day it would work next day it wouldn't, a good quality lead soon sorted this out
Another thing is that bt are upgrading all their broadband lines to 1gb/2gb it may have something to do with that.
hope you get it sorted soon !