Hi!
As some of you know I've been dealing with Phals for quite few years now. The repot has always been well and Phals never go wrong, by contrary.
I have repotted 5 Phals for my mother-in-law from bark to lava rock (the medium I have been using in the past year), they seat well for 4-5 days in my house, and then she took it on a 1-day trip to another state. My analisis is that they get over heated, but maybe you know better what could went wrong.
I don't have any plant with bacteria or infection, neither of these were mixed with my collection:
This is how I handdle it to her:
This is how she have them now: