Why every so often my Lumix FZ2000 shows cd card locked when it is not locked.

My Lumix FZ2000 comes up with CD card locked, every so often, and I have to replace it with a brand new card as it will not allow me to format the card or use the camera, any ideas. Even if I format the card in my other FZ200 and put it in the FZ2000 it still comes up as Locked, help please.
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