| Phrag Phirst
You don't say what kind of Phrag you have but most Phrags like lots and lots of water. In the wild many Phrags live on rocky cliffs where water is trickling down the cliff or they grow near streams. Because of this, most of my Phrags sit in saucers of water at all times. The exception is the caudatum-type Phrags which still like it wet but whould not sit in saucers of water.
Use a finer-grade moisture retentive mix for Phrags. small-to-medium bark and lots of other stuff to hold moisture, also charcoal to keep it fresh. Phrags hate stale mix. Stale mix is usually the cause of root rot. So Phrags should be repotted every year, even if they stay in the same size pot but just get fresh mix.
On to Paphs
Unfortunately yellowing leaves, especially on newer growths usually means either crown or root rot. I'd check out the roots and see how they are and I'd give the leaves a wiggle. If the plant has crown rot the leaves will probably just fall off in your hand.
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