Thunderbolt Display turns off randomly

I have a new Mac Mini 2011 i7 Quad CPU version.  I have a Thunderbolt 27 inch display.  I have found that the display randomly turns off and won't turn on when I use the keyboard or mouse.  This occurs when I am doing stuff on the machine, it is not a display sleep issue.  The first couple of times I had to use Remote Desktop to reboot the Mac Mini to fix the issue.  The last time it happened I removed the Thunderbolt plug from the Mac Mini and reinstalled it and this fixed the issue.  I have the latest software updates on the Mac Mini and the Thunderbolt Firmware update on the Display.
I am running Lion 10.7.1

Well, i've just patched firmware update for Thunderbolt display from Apple customer support site. I'm sure you've done this already because it's dated 19, Sep. Well, I'll try to find the pattern anyway if the same thing happens again.
And, for your information, those happened while i was using 'Remote Desktop Connection' from MS-Office, which i set as expanded 'full screen', targeted Thun-di, (I've mentioned i'm using dual display, Dell 2311H and Thun-di above reply).
Plus, I found some interesting bug for the 'full screen feature' of RDC of MS-Office, which is sometimes got confusing which 'desktop' it should use. when i added one more desktop from 'Mission Control', ran RDC in full screen mode from 'desktop 2', it should just remained on 'desktop 2' when i switched to my original 'desktop 1'. But, when i did switch to 'desktop 1', RDC just switched to 'desktop 1' and remained in 'full screen mode'. I feel strange, 'cause the feature worked fine yesterday, but not today, and the 'Thun-di''s gone randomly.
Too many clues and multiple bugs appeared at the same time, made me confused, RDC of MS-Office, Lion, and Thun-di(oh, just added patch from Apple, TT)...
Wait for solution with fingers get crossed, haha...

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