Samsung MicroSD card on LG G4 accidentally wiped?

A

AC Question

Hello,
My phone was factory reset twice within an hour time frame.
The first time it was reset, I noticed a 'Samsung SD Card Unexpectedly Removed' notification, but couldn't attend because of a problem with my pattern (wasn't recognized, and had to repeat usage into factory reset).
The second time it reset an SD card wasn't even registered. However, when I looked in storage, it was visible, along with the gigabytes it had used for my pictures and music. I took a few pictures, saving them into the SD card.
I unmounted and remounted the card awhile afterwards, only to find it was being read as if I had only stored that handful of new pictures. I am not sure what has caused the storage in my card to suddenly vanish (Factory reset? Corruption? Overwriting?).
Assistance with this problem would be most appreciated.
 

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