http://www.nikonchat.com/nikon-camera-error-code/

My Nikon D80 has problems?
Camera House now in the shop again to get the target as it is doing the freezing of the camera. Second time in the shop to fix and only 5 months old. Has anyone else had a problem with theirs. Consider the error code was R11. Any advice?
R11 is not an error code that the images of returning to fill the buffer see page 36 in the user manual. If the buffer is filling the camera is to slow or stop until there is space in the buffer. What SD card are you using?
Canon 30D ERROR 99, THE MOTHER OF ALL ERROR 99s