moving light fixture level changes dim other channels

I'm having a problem with an Express 24/48 console.  I am running a Martin MiniMAC patched to 10 channels, plus about 40 other stage lights.  When I change some levels on the fixture--either with faders, trackpad, or by playing back a cue (pan/tilt and intensity/strobe seem to be the worst offenders)--the other lights that I have on stage flicker.  This even happens if the MiniMac is not even plugged in to power or DMX. 

It seems that just sending changes to fixture-patched channels causes the flicker.  Lights that are on dim slightly several times while the fade (manual or automated) is happening.

I didn't check to see if it makes a difference with or without focus point references (I have both).

Any ideas why this is happening or what I can do to stop it?  Someone suggested that the CPU is just getting bogged down.

Thanks

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