Wed 23-Jan-13 11:18 AM | edited Wed 23-Jan-13 11:21 AM by swaussie
I use only a 64GB Sandisk SD card rated to 95Mb/S - nothing in the second card slot, no aftermarket battery grip, etc. It happens on mine on occasion as well. Nothing to do with burst mode, full buffer, etc. Its a bug somewhere and seems to be a random event as in I took close to 500 photos on the weekend and it happened once, so its not too annoying.