Intellabeam Logic Problem?

I have a half dozen Intellabeam 700hx and a couple of them are beginning to act a bit strange. They power up fine but a couple intermittantly re-iris, and pan off then return - almost like a rehome without restriking the lamp and rotating the wheels inside. Is this a data board problem? also, occassionally they do not reliably hit programmed cues. The pan/tilt will be off by several degrees consistantly but when re-starting the fixtures they seem to correct. I hope this makes sense. Any ideas would be appreciated. Since these are discontinued, I have one to cannibalize for parts and have done so for some items- mirror.
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