I think I have finally sorted out the instability problems I was having and it was all down to heat. The temperature here today is about 5C cooler than all the last month plus (and I think this is the important bit) I've re-ordered the PCI cards so the voodoo heatsink is not radiating heat onto the back of the logic board. My working theory is that the mediator was giving up occasionally when the cplds overheated. Anyway, along with a big case fan directed on the PCI area, this seems to have fixed it for now...
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