i have this issue with a sandisk ultra 16gb 30mb/s card. the screen would go black for a while the light on the dial would light up red and the error message would display for a few second then the camera would start cleaning the sensor automatically. this doesn't happen to often, i noticed it one or twice before but never right after each other, tonight it happened twice.
i have 3 cf cards, i have a kingston 8gb that came with the camera that never exhibits this issue, after a while i got a sandisk 8gb 30mb/s that also worked fine and never exhibit this issue, this error 02 thing started when i got my 16gb 30mb/s, that was around after i updated my firmware . i have yet to see this error on my first two card.
i tried to figure out when the problem occurs, i tried high speed shooting, i tried raw+jpeg, i tried video but i couldn't bring out the error, it seems that it occurs randomly.
could this be a firmware issue? mine is 1.2.3