Home Hub 3 Firmware update stops DNS queries and m...

I am getting very poor service after 5 phones about my incident 1403**-******.  The staff cannot understand my problem even though I have explained in clear technical detail.  Basically a firmware update has caused my BT Home Hub 3 to have very slow management web interface and fails to handle DNS queries.  It connects to the Internet Fine.
The Home Hub has been rebooted and reset many times and no improvement.
Help BT.

I have been DNS having problems with two Chromebooks accessing the internet ever since the latest firmware upgrade to my HH3 on 15 March - calls to BT went over their heads they just blamed it on the Chromebook as no other devices were having problems despite the fact that I made it clear that the problem only started after the latest upgrade - the muppet dealing with the problem even went as far as to say that BT does not support more than 6 devices connected to the hub at anyone time.
I found that the DNS problem does not affect you if you switch from the HH to BT FON even when you are on your own network.
I finaly got round the problem on the chromebooks by going into the settings page on the Chromebook, opening the HH3 settings and selecting  the option to use 'Google name servers' from the 'Network' tab.
It has long been an issue for me that the HH3 does not allow me to set my own choice of DNS unless I subscribe to a Dynamic DNS provider from their list - I prefer to use Open DNS to control my network as it allows me to filter out content across the whole network but to do this I would need to replace the HH and that would mean I would lose the Vision service

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