I am with Pipex / Talk talk. I Have a Belkin Share 300 wireless n modem / router. It does sometimes disconnect but the auto fix in Windows usually cures it. I spoke to the ISP when it was a bit persistent. Turned off PC and router, then turned on router first then PC. They reckoned it may be to do with having a fixed IP address and reccomended turning the router off for a while each day. I do not do this as often as I have a Vonage broadband telephone linked to the modem.Turning the router off for a while seems to fix it most of the time but it is annoying.
Sony Xperia Z5 review: Hands-on with the phone which the Z3+ should have been