@thechapswithmediators:
I dont own a mediator and never have, but I have a few questions and suggestions.
As you all seem to suffer from random/wierd errors, are you sure that all parts are getting enough power? (drawing as little power as possible through the powerlines of the motherboard is highly recommended) Also try cooling the chips on the mediator to see if overheating chips can be the problem. Just do a quick solution with a extra fan directed at the chips.
/Patrik