My 10 year old himilayan has begun doing the same thing.

We have four cats. The himmie is the oldest and declawed in front. Then there is a 6 year old neutered male domestic shorthair who goes outside and has all his claws, a one year old spayed female DSH with all her claws and an intact 6 month old female maine coon with all her claws (will be spayed soon)

We have four litter boxes in the basement, and they have not been moved in the year we've lived in this house. We have changed brand (we now buy the least expensive we can find of the clay litter).

No changes recently in people moving in or out.

This cat has been known to poop in other areas also, but usually it's just urine. She ruined the carpeting in the entry area at the front door to the point where we had to remove that section of carpet (now a tile floor).

This morning she went into the bottom shelf of the entertainment center and urinated all over my husband's Nintendo 64 equipment.

Bad kitty!!

I don't yell at her, I just clean it up. If she continues with this, I'm going to have to get rid of her and I don't want to do that. I've had her since she was a baby, and I always figured I'd have her until the day she died.