Phrags definitely are different than paphs. My experience, quite limited, is that phrags like more light, and damp 'feet', EXCEPT those with caudatum parentage - they don't like wet feet. They also seem to like it warmer than my paphs, which is fairly easy to do since they are in brighter light.
Jmoney is the guru - hopefully he will answer. In the meantime - get some new potting media and pull them all out for a repot. Check roots for rot, and how wet the interior media is.... Also, Phrags will catch water at the leaf axils and can develop rot, so you don't want to get the foliage too wet.