Re: HomeHub 5 is the most secure system in the WORLD
My parents router does this often (meaning they cant use their Skype cam to see their grandchild - almost the only reason they have an Internet connection)
The only solution I found is to turn it off, wait then turn it back on. Wait for all the connection lights to come on. Then (no that doesn't fix it!) perform a soft reset and wait again.
Why off and on doesn't work, or why the soft reset on its own doesn't work, I have no idea (except that it's the worst router I've ever had the misfortune to use! WiFi performance is so poor that we don't bother trying any more when we visit - just use the ethernet cable and he off of the grid for most of the visit).
Called BT but they have no idea what a Dhcp server is, let alone how to fix I. One of their engineers (their to fix a broken BT vision box) even said the problem was caused by network cables being plugged into the router and that only the WiFi should be used (forgetting that the BT vision box *has* to be plugged in via cable and screwing up the Skype cam in the process).