I have got the panasonic DMC FZ5 and when I want to take pictures of my kittens jumping in the air to catch things it comes out blurred. So I looked in the manual and it was going on about increasing the shutter speed so I increased it to 1/400 and when I took the shot everything was incredibly dark (you couldnt make out the kittens at all) is there anything I can do to stop this. By the way I was taking the pictures in the morning