I was on a shoot today with local fire dept. doing ice water rescues (training), very cold but all equipment seemed to be operating well. They get done and want to get a group shot, put on wide angle, do a test shot for exposure, all seems well and then I could not get an image. The shutter worked, the image went to the LCD screen on back of camera, but nothing on card. Perhaps a corrupted file ? or dead space ? Prior to this failure I had approx. 175 images that were fine. This is not the first time this has happened, but now has compromised an important shoot. I am going to get a new card regardless, but would like to know if this most likely the cause or does the camera need to visit Melville NY.