Why does my Mac Pro randomly flash a blue screen to both monitors?

For a while now my Mac Pro (Early 2009) has this occasional issue. The system uses a pair of ViewSonic 22" monitors. At random times, both monitors just turn to a solid light blue color. After a brief time (1 to 5 seconds maybe) normal operation returns. The system is still working. Text typed on the keyboard during the 'blue' screen still shows in whatever application I'm in. Just the screen seems to be affected.
I leave the system running 24/7 with only occasional reboots (weeks or months apart). The screens I turn off at night. Most of the time this happens right after the system 'wakes' in the morning (temperature does not seem to be a factor). Although the system is doing this as I'm typing this. The blue screens show up than go away on their own. This repeats from one to ten times before it goes away. Once it is 'done' everything is normal until it happens again.
This 'issue' has been occurring since the original Snow Leopard. But, it also happened with Lion and now still happens with Mountain Lion (just upgraded to 10.8.2).
I am thinking this has something to do with the graphics controller (NVIDIA GeForce GT 120 512MB). But, I've never found any online references to this sort of behavior.
Any comments or suggestions will be appreciated.

The cable connections have (so far) solved this problem for my situation. Even though the monitor's DVI cable was firmly connected to the mini Display port connector, when I touched it the attached monitor would go 'blue' or lose its connection entirely. After disconnecting and reconnecting this junction the monitors would still take a hit on touching the connection. I also checked the connection of the mini Display port connection to the graphics board and could not push it in any further. However, after a second go-round I unplugged this connection to the board and reconnected it. I am certain it was fully inserted the first time. But, connection contacts can oxidize over time and sometimes it may just need to be disconnected and reconnected to 're-wipe' the connections. This effectively cleans them at the point of contact. So in my case I'm thinking it was the connection age that was an issue more than a 'loose' connection. Either way, I haven't had this issue for the past two weeks.

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