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Last time I had this happening, I checked my SD card's serial number on Google and found out it was a very convincing fake SD card (i.e. it was a "64 GB" card that didn't actually have 64 GB of storage). Check your SD card's serial number online (should be on the back of the card) and make sure it's legit.
If it is, might also try reformatting it, see if that fixes it.
