It sounds to me like you need a new plant... if the root system is very robust, they will occasionally produce a new growth at the base of the plant. (Once the crown is dead, it won't produce any more leaves from the top) But it sounds like the roots system is in poor shape too.
It is really easy to overwater a Phal in sphagnum moss. For your next plant, consider repotting soon after you get it. Phals typically don't mind being repotted while in boom. I suggest bark rather than sphag, because it is free-draining. Roots suffer from inadequate air, rather than too much water. So if you use a free-draining mix like bark, the water flows through pulling air behind it, resulting in a healthy environment - "humid air" rather than "wet".
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