
!!! (jk

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Wanted to lighten up the mood a bit before I started.
1. We need more info.
- What kind of Phal is it? This answer makes a HUGE difference. Some Phals can bloom just one at a time and be absolutely fine. For other Phals, one flower per spike is an issue to consider.
- What are the temperatures during the day and during the night?
- What are the seasonal temperatures throughout the year where you live?
- What kind of light is the orchid receiving?
- What amount of light is the orchid receiving?
- What is the humidity of the growing area?
- How often do you water?
- How often do you fertilize?
- What is the concentration of fertilizer you use?
- What kind of fertilizer do you use?
- What is the N-P-K ratio of the fertilizer you're using?
- What is the potting media being used to grow the Phal?
- How are the roots doing? Did you do a thorough check of the roots, not just glance at it quickly and tell everybody that they're ok based on the condition of the roots you can readily see? What about the roots you can't readily see, are they doing ok?
- Do you have a pic you can post?
- How long have you had this orchid for?
2. Answer all the questions, and your question will be answered. Everything I asked, if answered honestly, will lead you in the right direction in how to properly diagnose your problem. I suspect a few things, but I want to be sure that they really are the cause and not something else.
I suspect that the problem is related with the way you're cultivating your Phal, and is not necessarily caused by any kind of oddball pathogenic microorganism.