Cut off a palm frond and take it to the county extension office, It looks like a mineral deficiency which can be corrected with some magnesium and mangenese simply spread on the ground around the tree. The magnesium part is very cheap -- epsom salts from the drug store. The mangenese may be available at the garden shop at Home Depot or Lowes.
BUT, don't do that right now. Take a frond to the Extension Service office. You might take a cup of soil from under the tree too for a soil analysis.
The tree should recover.
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