Hey duke.
I'm no video expert.... and a little more info on the camera model would help. But, I'm willing to go out on a limb here and take a shot at it.
Does your camera use a memory card of some sort? If so, the "processing" message may mean the camera is busy writing to the card and the write-speed isn't fast enough to keep-up. Using too large a memory card can slow down the write-speed in some cameras so you might try a smaller capacity card and see if it makes any difference.
Like I said, I'm no expert....