Problem with Internet connection via Wireless

Dear Friends,
I have a strange problem, we have network consist of 7 AP (1 WDS and other are WDS clients)
When we connection for example 8 devices to the wifi, 5 of them can connect to the internet, 3 of them can ping ip address of website but cant enter to the website, nothing happens, it can be in different proportions, 3 device can access 5 not, DHCP with all configs is on WDS access point, all of them connected to unmanaged HP switch which connected to the router
Please help to understand this
Thank you

Provide the details of the devices and configuration.

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I have lost my internet connection last Sunday evening upon my return from a weekend away from home. The last time I have used the internet connection on my macbook was the previous Friday morning. Prior to the apparent disconnection on Sunday, I have always used my internet connection wirelessly through Airport Extreme (that is connected via ethernet cable to the NETGEAR DG834v2 ADSL modem which had worked beautifully until the problem arose on my return). This wireless internet connection allowed me to surf the internet anywhere in my home.
However, upon the successful re-connection to the internet via the modem router, I have discovered several new problems. I have tried to set up the internet connection wirelessly again but instead the following happened:
1. Router (Netgear) drops ADSL connection and cannot reconnect when connected to airport via Ethernet. (which is the case when using airport wireless).
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4. Router connects to ADSL fine when connected to airport via Ethernet and computer is connected to airport via Ethernet.
So from the above, I cannot connect to the internet properly whether wirelessly or not so I suspect it could be faulty router or could it be airport extreme? I have asked my ISP for an explanation and all they have said is that it cannot be the mis-configuration but could be to do with the power adaptors or the way plugs are set up and suggested I take out all the power plugs (and power surge protector) out to switch everything off, the macbook, router, printer and airport extreme. However, when I have re-plugged them all back in, the problems I have described above still persists!
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Problem with Internet connection via Wireless

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