Wireless devices keep dropping, Wired works 24/7

Hi,
We have had bt infinity in our home for a few months now, and only in the past few weeks we have been having constant problems with wireless devices. We have one computer wired, one wireless and a few other devices such as tablets phones etc. The connection on all the wireless devices keeps dropping with no response, while the wired one is still working perfectly. The problem is becoming more frequent than ever, I spoke to tech support at BT who told me to log onto my router and change the channel to 11 but since then, zero improvements.
When i troubleshooted the internet connection problem on the wireless pc, i got the message
" internet connection doesnt have a valid ip configuration"
Can anyone help? or is my hub giving up the ghost?
Thanks!

There is some help on this page.
Wireless connection problems
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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