Well, there are kind of two answers to this question.
First, a Phal will lose old roots just as it does old leaves. It's all part of the natural cycle of growth.
However, older roots on a Phal can remain viable after leaves grown around the same time fall off. Typically I'd say that if the roots are shriveling, and you aren't overwatering, the plant is doing pretty well but is asking for a bit more humidity.
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