microSDXC 64GB card - LOST+FOUND

I am now on my second SCANDISK 64GB microSDXC card - formated to FAT32 by the fairphone 2.

On the second SD card I noticed that the phone is continually produces files in LOST+FOUND folder in the SD card root. The first card eventually became completely unreadable and unrecoverable. The second SD card I intervened and am now trying to work out what is going on…

Anyone have any ideas?
Is there an application that is thrashing the SD card that I don’t know about?

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