As noted by others, it could be the plant is just not able to "breath" When catts are out in the wild, their roots are generally exposed to the air.
Also, when my plants get large, I move away from bark, or other water retention media, to a more loose and airy medium. My favorite is Stalite, charcoal and sponge rock. Yeah, I have to water more often, but worry less about rot.
And in closing, while your leaves look lovely, they really should be a lighter green from more light.
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