After ten years, my perfectly well-behaved cat started peeing in our living room (which is next to the laundry, where the litter box is). He is targeting one specific corner.
People have suggested he might be sick, but he is acting normal, sometimes he uses the litter box for pee, and he always hits the same corner when he doesn't. If he were sick I would expect him to go wherever he is when it's time, not go to the southwest corner of the living room every time....
We keep the litter box clean. We tried changing the litter brand but that might have made things worse; there has been no pee in the litter since the change.
I am about to buy baby gates to cordon off that room....