Might possibly be it's failing. How long have you been using it? Have you tried another micro-SD in the phone? And if it's still doing same thing, could be a problem with the phone itself.
Have you got another micro-SD you could try, or try the 64GB in another device or computer? It's very likely either the phone or the micro-SD that has a problem, so you need to eliminate which one it is.
I would suggest removing it and backing everything up now. Mine was doing this and I lost all photos from the first 9 months of my daughters life. Every single first holiday. It was VERY upsetting.
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