Macbook Pro Retina Wifi (5Ghz) lost on Wake

Hi All,
I have seen loads of posts on wireless performance issues.
I have both pre N and N dual band routers.
My dual band is set to 5Ghz (300Mbps)
My Pre N is set at 2.4Ghz (150Mbps)
I can see the 2.4Ghz network which has my old PC and and old Iphone 4 connected to it. works fine albeit a lot slower than my new Virgin media full N dual band router.
I can occassionally see and connect to the 5Ghz network on my MBPR, when I first start the machine that is.. This 5Ghz network btw has my apple tv, ipads and iphones + some of my kids windows machines all connected to it.. so I know it is not my 5Ghz wifi network.
When connected if my MBPR goes into sleep and I wake, the connection is then lost and I can not re connect to it, or even see it.. even with a reboot of the MBPR or even toggle the wifi on and off, I still can't see the netowk, but know that it's there as my ipad and work laptop are connected to it and working.
Occassionally it comes back but frustratingly wont let me connect to it by telling me the connection has dropped out.. this is a pain as I bought this machine well over 14 days ago and clearly I now can't take it back:-( GRRRRrrrrrrr.
I've looked for work arounds and can't find anything which could help me. Running the latest patches and updates from apple but still annoyingly doesn't work correctly or as it should.
I want the performance of full N especially as my product tells me it has a full N card in it.. I am very dissatified with this product, issue and my new MBPR!
Not what I expected from apple when spending some £1,250 on apple product.
Does anyone else have this specific problem.. I've seen lots of people having issue connecting to 2.4Ghz networks.. My problem is that I can acctually connect to the 5ghz network. but when i am connected sleeping the machine causes the issue to become very apparent.. Bluetooth is disabled too! Grrrrr
Clearly this is annoying the **** out of me.. I want to watch a movies on my apple tv and now can't easily.
If someone could help it would be appreciated and likely save me from going into an Apple store to figure out what the **** is going on.

I had the same problem when I got my MBP a year ago. Dropping off the network and same issue (at that time I didn't try 2.4Ghz vs 5Ghz) but I noticed that it was only a problem at my home. So I upgraded my router to a D-Link 815 which is a N Dual Band Router to overcome this problem by using 5Ghz or just trying a better router for that matter. I wasn't successful either because the network was just dropping.
So the solution I used for the past 13 months and works for my MBP Retina: since the problem was mostly about authentication I changed the authentication from WPA/WPA2 or WEP to nothing! but instead assigned my MAC address in the router for safe connection and rejecting any other device that is not listed. You can check this for yourself by testing your macbook connectivity when you don't put any password on your network and see if you have the same issue or not.
this is good for registering your device MAC address to your router : http://wintelguy.com/2010/20101024_mac_filter.html
Hope that works for you as well.

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