I was shooting yesterday and out of the blue I got a "memory card not formatted" error when trying to take my next shot. I had just taken a shot about 30 seconds prior so I was confused why this would come up. Since I had only taken about 5 shots, all landscapes, I just formatted the card with the camera and re-took the shots I had just taken, and kept on shooting. About 10 minutes after that I got an error 99. The camera said to turn it off and back on, and then replace the battery if that didn't work. So I cycled the power and the error went away, and it has been fine since. Is this something that I need to worry about? The camera is only 2 weeks old.