need suggestions as to why my cat may be suddenly ie once a week, pooing upstairs (2nd floor) instead of in her litter tray which is downstairs (ground floor bathroom). I've bought this spray that is supposed to deter them once it has been cleared up but she still does it although she still uses the litter tray. can't work it out. she seems normal in all other ways. nightmare as i have to clear it up off carpet which makes me want to vomit. it could be because she is being lazy and carn't be arsed to go down two floors?...