Answer: It's natural for the oldest fronds to yellow and die off. If the yellowing frond is near the bottom of the plant, it is perfectly normal and should be cut away from the plant when it is completely yellow. If the yellowing frond is the newer growth, it could indicate over or under-watering. Since your plant is in volcanic rocklike growing medium, it is a plant that requires extremely fast drainage. As long as you water on a regular basis, and don't keep the media soggy wet, it should be just fine.
Best wishes with your palm!
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