You moved your Phalaenopsis from a large pot to a snug one. Most roots were rotted; new roots emerge but turn black and die quickly.
Even in a smaller pot, if you water before the mix is barely moist, roots suffocate and rot. Phalaenopsis roots need moisture and air—constant wetness kills them.
The smaller pot dries faster, which is good. But you must match watering frequency to the actual drying rate, not a calendar.
New roots turning black = they're drowning. Let the mix dry more between waterings. The plant will respond with healthy white/green roots.
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