If the spike is still green and healthy looking, then it's fine. Sometimes they take their time. Orchids seem to do things at their own pace rather than at ours.
Moving the plant to your home has caused it to need some time to acclimate to a new environment. The change could be a cause of the slowing in growth. Also, light and temperature levels can cause the same. What sort of light does it get? You might try moving it to where it gets a little more. Also, Phals really love a nice, warm day with a bit of cooling in the evening. What I do in my house is in the evening I turn my AC down pretty well (I live in Georgia, after all), then in the morning, before I go to work, I turn it up about 8 or 10 degrees.
Finally, is the plant also growing a new leaf? The orchid spike/blooms are essentially just a kind of specialized leaf for the plant. If it's also growing a real leaf then it may be focusing energy there. Consider a light spraying of fertilizer just on the leaves to give it a little boost.
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