Logicboard fried each time mba goes into sleep with external screen attached

I got new Mba 13". Plugged in my Phillips 24" screen as usual. Went away for an hour or so. Come back, and MBA doesn't wake up from sleep anymore. It's just dead, no light etc. I've tried all methods described here.
Brought it to service centre, they tell me logic board chip set is completely blown. So they replace to new logic board. Two days later, excactly same problem. When I put it to sleep without external screen, it seems fine. But once I've external screen attached. I've put it even manually to sleep. I only heard a small "flop" sound. And then again. MBA is dead.
So same thing. Brought to service center, they check. Again logic board fried. Also they told me that a lot of customers have same problem. Some ppl even replace logic board for four times!!!
Come on apple? Seriously? Whats going on here? Anybody have same problem and found solution? (except not putting it to sleep and contiously repair logic board).

Just an update on my situation...  My 2nd logic board fried after about 5 days of use.  Its been in the shop now for about 3 weeks waiting for another logic board as well as the USB daughterboards.  Not sure how they determined that they needed to be replaced - I think they're just guessing at this point. 
When you guys had your boards fried, did you have anything plugged into USB?  I have a USB hub plugged in, and the hub has a hard disk, and logitech camera attached.  Its been plugged in during each failure along w/ my monitor (a 22inch LG).
At this point I have no faith that the repairs will fix this.  I've replaced my power strip, and will replace my USB hub next, but I just don't believe anything external is causing this, as I'm using all the same components with another laptop w/o any issues. 
This next repair is my 3rd repair attempt, and my machine has been unusable since December 6th, 2011.  Apple better replace it if it fails again.  Nothing like buying the top of the line machine and having it in the shop for half as long as I've owned it.    Apple's handing of this situation has been extremely poor, and as a first time mac owner, all I can say is I am not impressed. 

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