I’m having exactly the same problem. All of a sudden, the MicoSD card is in a “frozen” state… I cannot write to it… I cannot delete it… I cannot format it… It “appears” to work… and it appears to accept alterations… but when you remove it and reinsert it… it goes back to the way it was… any deleted files magically reappear and anything new added disappears.
WORTHLESS… Never buying SanDisk again.
