Hello Anthonyat and welcome to the Orchid Board.
You are probably keeping your phal too wet, and the roots are rotting. Pop the plant out of the pot and check the roots. If they are brown/black mushy, they are rotten and need to be cut off. If they are green or silvery white they are healthy. Moss has a tendency to stay wet in the middle, even if the top is dry and crunchy. You ought to repot in an orchid mix that allows for plenty of drainage and air.
Can you post a picture?
Joann
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