Where do you live? What are your growing temperatures? I'm going to bet it's too cold where you grow them. People often manage to keep Phals alive in typical house temperatures but the plants are not really happy about it.
Also plants with mealy bugs, even invisible, often will not grow - especially if in poor conditions, like too cool.
A Phal put into S/H in a nice warm space will immediately take off growing faster than you have ever seen one grow. If your plants aren't making new roots all the time it's too cool where you're growing them.
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