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I think your plant has outgrown its pot and wants more space. Probably maybe a bit hungry too.
I would transplant up to a bigger pot and give it a nice feed with a balanced PH and see what she does. I would also consider fabric pots. Plants perform better in fabric vs plastic pots.
I agree, transplant and continue feeding as you are and wait and see. Often plants overcome these issues by themselves. If it persists then you can start thinking of a deficiency.