Mac Mini 2011 screen blacks out during heavy screen activity

I have a Mac Mini 2011 i5 2.3Ghz with Intel HD video. It's connected to a 30" LCD 2560x1600 (Dell WFP3008) via mini-DP to DP cable and a 22" LCD 1920x1080 (Samsung LCD TV) via HDMI to HDMI cable.
For the first few weeks I had it connected to the 30" only and it was fine. Then I hooked up the Samsung as a second display and the problems started.
The problem is that the Dell blacks out briefly, then comes back. It is not "drawing" the screen black, the signal to the Dell gets disrupted momentarily so the monitor has no signal so it goes black. Then it resyncs with the signal and the display is back. This only happens to the Dell, during the disruption, the Samsung image stays put. I know it is a signal disruption because the Dell shows a displayport icon showing that it has just resynced to that input.
The problem happens more frequently when more things are going on; like if I have a window or multiple windows playing video, then the disruption happens more. If I disconnect the Samsung, it happens less. It could even happen if a web browser window taking up a large portion of the 30" screen does a full page update, it will disrupt. If I am running Adobe Lightroom, it seems to happen more also.
When it happens it seems like messages like this appear in the console, although i can't say they are directly correlated:
6/1/12 8:28:46.000 PM kernel: IOSurface: buffer allocation size is zero
I'm thinking perhaps the mini is running low on memory since the 2560x1600 is pretty high res and then add the 1080p screen and stuff being updated, perhaps it runs out of memory and disrupts the signal while it garbage collects? Pure speculation.
Has anybody else seen this and have any clues on how to resolve it? Thanks.

I should clarify that when I say perhaps the mini is running low on memory, I mean low on shared video memory, since the computer has 16GB installed. I'm not sure how to view or test shared video memory allocation.

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Mac Mini 2011 screen blacks out during heavy screen activity

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