It is difficult to know exactly what is happening with your palm trees that I suspect that either they suffered a little cold damage or they may be going through some stress due to an extended period with dry soil on the container. It is also possible that the roots are suffering from soggy conditions if you are watering a lot and the container doesn't drain well. Try to maintain even moisture and they should be fine. Any friends that have turned yellow or brown can be removed but as long as there is still green on them leave some because they are helping to sustain the plant.
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