Home Hub 3 - Connection dropping from N to G?

Hello all; I hope someone can help me with this!
I have recently installed the new Home Hub 3 (replacing a Home hub 1). I have it connected by wifi to a Mac which has a built-in 802.11 connection. The reason I changed to Home Hub 3 is that next month I am getting a digital box for the TV which works best using a 802.11 N connection speed.
Normally, the connection is by 802.11 N (I can see this on the Mac SysInfo), and I get a solid 5 bar connection. However, sometimes this drops to 1 or 2 bars, and the wifi speed drops from N to G. When this happens, I cannot change it back to a N speed without rebooting.
Does anyone know what might be causing this? It seems to be random. The computer is not moving, and is only about 12 feet from the Home Hub with clear air in between. Is it likely to be the Home Hub which is causing the change, or the Mac? Is there anyway to "lock" the Homehub to only broadcast on N?
Thanks for any answers.

the only problem changing the BT Home hub 3 wireless channel manually it stops the new software from finding the best channel one of the features of the new hub. they advise this in the product page details (section taken shown below).What i found was to experiment hub positions my example i have 3 story house so i placed the hub on the second floor away from fridge /microwave/ wireless phone etc on the 1st floor. the wireless computers are on floor 2 & 3, it improved reception by 50%. the computer down on floor 1 is connected by ethernet.
Change wireless channel
Your Hub is always monitoring the wireless channel it’s using and if it detects too much
interference it will automatically change to another channel. If you want to manually
change to a channel of your choice, follow the steps below, but this will stop the
automatic channel selection feature.
1 Access Hub Manager by typing bthomehub.home into your web browser.
2 Click Settings.
3 If asked, enter your Hub Admin password. You’ll find this on the bottom of your Hub.
4 In the Basic Settings menu, click Change the wireless channel to avoid interference.
5 Click the Refresh button.
6 Wait a minute for your device to pick up the new channel.
http://btsupport.custhelp.com/ci/fattach/get/1893113/1296055445/redirect/1

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Hi Welcome to the community forums
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If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
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I can't find the solution to this anywhere so here goes:
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Solved!
Go to Solution.

After trying lots of ideas, I think I now have a solution and some idea of what may be causing the problem. I hope this explanation may be of help to anyone else facing a similar problem.
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you must have marked it solved go to my post which is marked as solution and then options and you be able to unmark the solved marker
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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