I have had my cat since July and he has always been very clean and easy to do deal with. All of a sudden (for no apparent reason) he began to go to the litter to do his buisness and he would stay there. I walk in and he is just laying there in his litter. This disgusted my girlfriend and I. We don't understand why he is doing this but it has been going on for a month now. What can I do to stop this behavior? I want him to go to the litter, just not lay in it after he goes!