Poo in the bath - a dirty protest??

[CantChoose]

DCat has done a poo in the bath about 5 times in the last fortnight. His litter box is right next to it.
He's occasionally done this when unwell with diarrhoea and his litter box is already dirty (at least it's not on the carpet!) but these are normal poos and he's only weeing in the litter box. We are changing the litter more frequently in case it's smelly in the heat but it's not made any difference.
Any ideas??

Another litter tray perhaps? Tbh pooing in the bath is preferable to the floor or carpet!
Maybe he prefers one for poops, one for wees?

Is his tray open or covered? Just wondering if it's open he may feel more secluded in the bath. Could a covered tray give him more privacy?

could you try a new litter tray in the bath - then move it gradually to where you really want it to be?

The tray is covered but that's a good idea. I could try leaving the cover off for a bit in case it's the other way round. Though he's been happy to use it for the last 3 years :/
Maybe we should just buy a new litter box and see if he's just randomly gone off the old one.

Haha mermaid good idea but the litter box is pushed against the side of the bath anyway so you can't really gradually move it across! The box and where he's pooing are within a foot of each other :/

My wee sod of a cat does the same thing. It started when he was a bit constipated (apparently the cold in the bath is soothing if they're a bit sore) but he's now decided that it's the only spot he wants to poop

It's annoying, it as a pp said better then the carpet!

One of ours has been doing this - I make sure the litter tray is cleaned as soon as possible and we've had some success with putting either a wet towel or a sheet of foil down in the bath to make it less appealing.