We have 3 cats, 2 males we've had for 7 years, and a new addition female 4 years old that we've had for just less than a year. All are neutered/spayed. All of a sudden we've been finding poop and pee on the basement floor. The litter boxes are kept clean. It started as just pee in the same spot happening more and more frequently. It has recently progressed to poop as well, and now it's in different places around the house, even in the closet. I'm just at a loss, we're not even sure if it's just one or all of them doing this. They are all loveable and we've never had these behavioral problems before. I LOVE MY CATS, ANY ADVISE???