After trying everything, you have nothing to lose by opening it up and replacing the micro SD card. I did it when my Libra 2 started freezing or even restarting on its own several times a day. It's not too complicated and is well explained in some posts. In my case, I cloned my own defective card (I assume the writing had started to fail but the original data was still intact), and it ended up as good as new.
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