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I'm not saying 4 months. I was running Windows and Ubuntu on these memory devices, which have significantly more writes than the small mobile OS of Kobo.
When SD cards go bad, they could have bad flash memory sector (which indeed takes years to turn bad). If it's one sector, that's located where an ebook is placed, you can delete, and re-download the book, so no harm done there.
If the bad sector is on a boot sector, that's another story.
There's also the possibility of a bad sector caused by a software error; which if any boot or operating system file is being written while the error occurs, could lead to a buggy or failing device.
Software errors could happen because of a variety of problems, and are probably the leading cause of buggy programs (next to buggy programming).
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