I have a cat that is new to the family. We have had him two months. He has been a very good boy always using his litterbox. This AM when I woke up I noticed one very small stool on the floor a few feet away from the litterbox. I checked the litterbox and it was empty. What was found on the floor is appx. 1/4 or less of his normal bowel movement. I clean his box 2X per day and have done so since I got him. Again we have never had a problem before. Should I be concerned that this is a behavior problem? Is this something that happens once in a while? I have never had a cat before so I am not sure what to expect.