have been having thi problem for a week or so as well.
Are BT doing anything about it?
Your problem could be connected with your other post about BT Desktop help. Once you have uninstalled that piece of junk see how you get on and post back. If you still have a problem start a new post and detail what is happening.
I have a HH3 that keeps losing connectivity, both wired and wireless. Over a period of 6 months it has lost connection so many times that I have lost count.
The signal is there and all the lights are blue but it does not connect. Sometimes restarting once will do the trick other times it is a couple of restarts or a full reset before it is working again.
I have spoken to BT Helpline a couple of times and not had any luck even though I spent over an hour on the phone each time. Big problem is that they do not have experts answering the phones so they just go through the script. We changed channels, even though that has no effect on the wired connection, and carried out a few more checks but the problem remained. We even ran a check of the WIFI output which reported that there was too much metalwork around the hub. At the time the hub was dangling out of the attic in mid-air with my laptop about 2 feet away!
They refused point blank to send out a new hub but I have fixed the problem by buying a new router.
A TP-Link WD8980 Wireless Dual Band Router has now been in place for a couple of months and not been restarted yet but still going strong! The hub is in the bin where it seems to fit quite nicely!
Glad to hear that you are now having trouble free internet by replacing the homehub. Rather than throwing it in the bin you should use it for somthing usefull like a door stop or a paper weight!