I'm not an expert, but when I get a Phal, when the bloom dies, I cut it back and repot in a bark media. I've never had luck with Phal's in sphagnum. They get overwatered and the roots rot. Leave it alone and don't overwater. Hopefully it's just the change of environment. Have been experimenting with my Phals in hydroponics..amazing results. The roots are beautiful. You can Google for info as well as check You Tube. Good luck!
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