In my opinion, the original microSD card, a MkFounder brand, started to fail when writing data. The daily crashes always began when I tried to highlight text and it wouldn’t work, and then the device would reboot without saving anything. I was able to successfully clone the card (so reading still worked fine) onto a new one, and it’s been working perfectly ever since. Admittedly, the brand isn’t exactly one of the most reputable…
Nevertheless, it's an advantage to be able to fix it yourself by simply replacing the card.
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