Very strange. I suspect that your plants may be either suffering from a temporary dry condition, soggy wet conditions, or possibly from a buildup of something such as salts in the soil if you water quality is poor. If they have been too wet for too long a disease may also be causing the decline. Try to maintain even moisture, trim away any affected fronds even if it means cutting them back to the soil line. They should resume normal growth. Consider applying a very dilute solution of soluble fertilizer such as Miracle Gro or Peters occasionally at the low "Constant Feed" label rate.
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