I would be checking the undersides of the leaves with the white speckle marks and confirming with a magnifying glass or something equivalent that it is not a pest like thrips or spidermites.
I have had mites in the past and this is how it presents then the webs start forming. They are hard to see and if they are just starting out they are not a populated and easy to spot. The eggs are whats easier to see in my view, they are a brighter yellow and spherical in shape.
Good Luck!
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