Not a whole lot to share. Phone was unstable for a bit and one day refused to boot past a blank screen. As far as I could tell from trying to pull data off it, something got corrupted and it could no longer boot but my data was all encrypted with no way to pull it off.

It depends on the storage medium. SD cards will fail if you use them enough. Photographers and videographers will run into to problem every once in a while, especially if they’re a professional. Why SD cards in particular have a tendency to fail, I can’t exactly say. It might just be their form factor making internal physical damage more likely. I say internal, because the issue is that a normal looking SD card will one day turn up corrupted for no obvious reason.

I haven’t heard of any other type of flash memory having lifespan issues for regular consumers.