Internet cuts out for a second every 30 mins

there should not be interference based on that xirrus screen shot
and the signal strength looks OK

issue would be if the virgin media router actually had some form of issue , where it was disconnecting completely both wireless and Ethernet connections
then all you have done - is added a router to a fault situation.

it may be a DNS issue
But the time it is disconnected makes it difficult to fault find

you are using virgin media DNS servers, so they should be good
BUT as a test

try using google open DNS

Google public DNS
Note using google public DNS servers from outside the US may actually slow performace - so use the following as a test to identify DNS issues - if these resolve the issues , then we need to investigate further to optimise the use of DNS


Google public DNS
https://developers.google.com/speed/public-dns/

Theres also a link on how to setup those DNS IP address up on a PC
http://code.google.com/speed/public-dns/docs/using.html

Then once you have set up those DNS entries

Flush & register DNS

Hold the Windows key and press R, then type CMD then press Enter to open a command prompt box (A new dialogue box - black with white font, will appear on screen ):
In the command prompt window that opens, type the following commands:

Ipconfig/flushdns
ipconfig/registerdns

If you receive the message
The requested operation requires elevation.
Then please open the command prompt as administrator
Start> All Programs> Accessories and then right click on Command Prompt, select "Run as Administrator" to open a command prompt.

now type the command again

I have found these to be a useful tools to use for DNS testing
https://www.grc.com/dns/benchmark.htm
https://code.google.com/p/namebench/