No don't be sorry for the questions, it's good so that you can help diagnose the problem
It is potted, but I don't think it is a root problem since the roots are growing well, and there are no pests in my phals, especially since my garden is like a spider paradise. However these spiders can't help to get rid of the fungal and bacterial attacks...
I suspect that there is some sort of rot as I managed to uncover a black spot on the stem under the shrouds of dead leaf scraps, however it's still firm so I don't think it has advanced, I applied fungicide just to be careful anyway.
I water normally like my other phals, light too, so I find it really weird, that all my other phal NOID hybrids and bellinas are doing well while this isn't.