Late 2012 Mac Mini display goes to black for a few seconds at random intervals

I have a late 2012 Mac Mini, Ivy Bridge, connected to a 24" Samsung LCD dsplay,using the HDMI to DVI video cable that came with the Mac Mini. At random times when I am doing something or browsing the web, the screen will go totally black and then revert to the proper display. This Mac Mini is connected to a 2 port KVM, however I never see this behavior when the KVM is switched over to the PC. Has anyone else seen this behavior?