Problem waking MacBook Pro when connected to external display

I have the new 13" MacBook Pro and like to use it connected to an external VGA display (Xerox) with the MacBook Pro in closed clamshell mode. The problem I am having is that after working for a a few hours, when I put the Mac to sleep with mains power connected, usb keyboard connected and the external display connected (via mini display to VGA adapter), the Mac will sometimes refuse to wake. I have a wireless Mighty Mouse also and the Mac is set to wake with Bluetooth devices. When I click a key on the keyboard or click the mouse a few times the pulsing sleep light at the front of the Mac goes solid but nothing appears on the external display. If I open the MacBook Pro the solid light goes out but the Mac does not respond. If I close the MacBook Pro display, the solid light comes on again. I have no option but to force a restart. This is an intermittent problem. I have yet to have this happen when no external display is connected.

I have the exact same problem.
Here's my story:
To give you some backgroud, my setup involves having the macbook on a mstand hooked up to an external monitor. I run a usb hub from my macbook, this is where my mouse transceiver is plugged in. I use am Apple wireless bluetooth keyboard (latest slim model)
I recently purchased the 13.3' inch 2.26 MBP as I gave my older 2.0 uMB to a family member. The computer is in the stock configuration with no hardware upgrades.
I have noticed weird behaviour when waking the computer from sleep when the lid is closed. When i wake the computer up (by tuning on bt keyboard), the keyboard light blinks like there is not bt connection and the computer will wake in an inactive state. The led light will be on, but when i flip the screen up....nothing. Screen is dark, keyboard pressing does not illicit any responses. I have to do a hard reboot by holding down the power button to restart the computer. Unfortunately any previous data or work is lost.
I work in IT so I completed troubleshooting and also things outlined on forums in google. Reset PRAM, reset SMC and also reinstalled OSX. Still I get the same result. Fearing I purchased a defective unit, I called Apple and they told me i could exchange the computer so I dropped by the apple store and exchanged it quite easily.
I've spent hours restoring from time machine and I am experiencing the same issue on my new laptop. I'm now assuming its not hardware but more firmware related as I had to do a bluetooth firmaware upgrade when I bought the computer when I checked for software updates.
Is anyone else having any wake issues with their new MBPs? And what should I do next? Should I exchange for a 3rd unit? Thanks for you help everyone.

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