10.7.5 Screen Issue on Mac MINI

Hello,
Since upgrading to OSX Lion (10.7.5, build 11G56) on my Mac Mini, my computer frequently forgets what the screen looks like and begins cycling thorough different screen resolution configurations (each usually worse than the previous). 
At the moment, it is stable, and showing the video as: AMD Radeon HD 6630M - 256MB
System: Mac MINI - 2.7 Mhz Intel Core i7
Memory: 8GB 1333 Mhz DDR3
The monitor is an ACER x211W - SD and is generally connected via a KVM switch, however, I eliminated the KVM switch by directly attaching the system to the monitor. 
I've disconnected all the video cables and reseated them.
Running apps: MIcrosoft Outlook, iTunes, Safari, MyDay, Quicken Essentials.
It did this occasionally (but tollerable) on the prior release of OSX, but since the upgrade, the system is becoming almost unusable.
Thoughts?
Greatly appreciated.
Rade

I think I have isolated the problem to the temperature of the unit.  The system worked fine for several hours then began degrading.  The Mac MINI felt hot to the touch.  I unplugged everything, took the access panel off the bottom and hit it with compressed air (quite cold on expelling from can) until things felt cooler again. 
There were no gobs of dust or animal fur flying out, nothing noteable imbedded in the circutry and the circulating fan is, indeed, spinning. 
So far, the system seems stable again, but it has been only about 20 minutes.  

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