have you checked for spy-ware/ viruses ?
maybe because in the evenings the network is overloaded because of people using torrents and a contention ratio of 50:1
i was on bulldog for years until one day my inet went, and seeing talk talk own tiscali who owned bulldog and like you i wasn't getting anywhere, i looked which offered the best deal and service. i went for virgin media after a few problems (trying to over charge me
) i have never looked back
20mb, tv and phone
