Our cat Rally who is 4 years old has been quite a great girl since we got her. Lately, she has been doing her business on this small carpet we have in the laundry room where the boxes are. (we have a total of 3 cats). My wife and I cannot confirm if it's Rally but we are pretty sure. She only does it there, no where else in the house.
We love/hold her and love her as much as we can, which is a good amount so I can't say it's neglect. We thought that maybe the boxes were old so we replaced them with brand spanking new boxes. She acts like she always had.
She just came from the vet in the last month or two and she is an inside cat, so I'm not thinking she is sick.