Heres a pic with a root thats fine but dry in a little spot. Im pointing to it with a stick.

These toots have yellowy green color

Here you see the roots pointing up. Everything ive read about fungus and rot points to leaf problems, but theyre perfect, always have been.

Here you see the roots pointing up. Everything ive read about fungus and rot points to leaf problems, but theyre perfect, always have been.

{{!gwi}}

The plant is in pretty good condition, it is normal for old roots to rot off and die. Provided the plants grows new roots at regular intervals all will be well.

You need someone to tell you how often to repot Phalaenopsis.
Tell us where you have the plant and the temperature ranges there, to provide clues re. No flowers.