Some wireless devices not connecting/dropping conn...

Hi,
Am hoping someone can help or suggest possible problems/solutions...
For the past couple of months several of my devices that used to connect to the Internet via my Home Hub 3.0 wirelessly now regularly fail to connect to the secure connection, requiring a reboot of the hub before they will connect to the Internet - which they then do. This problem occurs again after a period of time (haven't really been monitoring how long - probably after it looses the connection (switch device off, or leave Wi-Fi area)).
The devices will connect to the Internet via unsecured BT Wi-Fi or FON all of the time, and will also wirelessly connect to the secure hub but will not pass through to the Internet - or at least the device will show connected to the secure WiFi (but will not connect to the Internet if tried).
I noticed that another post refers to a Hub 3a upgrade recently (finishing in January)...could this have caused some kind of issue on my hub not allowing certain types of wireless connection/pass through? The devices that have problems may be a little older - Netgear WNA3100 (802.11 b/g/n) adapter and an android phone (802.11 b/g/n), however another android phone and laptop adapter do always work?
I'd be grateful of any suggestions?
Thanks...

This page may help.
Wireless problems and things you can try, to resolve them
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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