Cat will not stop pooping on couch.

I’ve been losing my mind with this one especially as we’ve done a lot of research to try and fix the problem already.

There are two available litter boxes, one that’s an open box “regular” cat box plus one that’s one of the automatic cleaning type. (Got the second one after being worried the cat didn’t like the automatic one, even though I’ve seen him use it).

I’ve put him in both litter boxes (one upstairs and one downstairs) multiple times. I see him use it. The litter boxes are cleaned daily. He’s been neutered since he was a kitten.

And yet maybe 3-4x a week he poops on the couch. He’s not sick. He doesn’t have worms or fleas or anything like that. He’s been on the same diet consistently. This just started like six weeks ago.

We took the couch apart completely on that side so instead of just washing the cover we also washed and steam cleaned the insert and used odor remover and then also let it air dry outside for two days to really get any remaining odor out so he wouldn’t be attracted to that spot.

Also used some cat deterrent spray over there.

So far nothing has worked. I am SO tired of recleaning the couch. I know you can’t spray or spank your cat or “discipline” them like that but idk how to even “redirect” him when he only does it when no one is watching.

Please any help or suggestions. This is getting unsustainable