iSpot Nightmare

I am working in a venue that has 11 iSpot 575 fixtures in it, and they are performing very eratically, either strobing, or dimming a second or two later than the rest of the fixtures. I have several other fixture types on this show and none of them are having any problems. This seems to me like a DMX refresh issue with the coemars. Any insight on this? I tried using a couple of different refresh rates on the DP and some of the settings made it worse but can not make it go fully away.

The house console is a Hog 500 which does not seem to cause these problems.
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