WiFi stays connected but internet keeps dropping

Hi all
Got a number of wired and wireless devices on my home network, all fed by my BT HomeHub 3.
What I've noticed recently is that both my iPad and my wife's Samsung Galaxy Tab keep dropping the internet connection. The WiFi connection appears to be unaffected. We're also getting issues with other wireless devices, but to a lesser extent as we use those considerably less.
I've done all the troubleshooting I can think of to date. I've done a hard reset on my ipad, reset network settings, restored the ipad, changed the web key, but as I'm sitting here tonight not 6 feet away from my router I'm still getting internet disconnection, whilst still full bars on my wifi connection.
I've already done numerous router reboots, and now considering a factory reset. Any other suggestions? Possibly a faulty router, or too many devices on my network?

OK, full reset done on the HH3.
I haven't touched the Channel seletion at all, and it's returned the following:
Here's the results from my WiFi analyser:
My main WiFi from my router (TvLounge) is showing on channel 6. I also have another BT HomeHub 2 connected off a PowerLine adapter acting purely as a switch / WiFi access point on channel 9 (OldLounge) and finally an all-in-one PowerLine adapter and WiFi access point on channel 13 (CharlottesRoom).
As soon as I have reset the router i restored the SSID and WPA / WPA2 password to as it was beore. Directly after this, all devices successfully reconnected, and I immediately had intermittent WiFi issues on all connected devices (still connected to the router but loss of internet). At the time I was connected with x2 iPads, x1 Samsung Galaxy Tab, x1 Android phone. Throughout this time I was still able to connect to the internet via my server.

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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
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WiFi stays connected but internet keeps dropping

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