I really don't think the magnets being too weak or improperly placed are the issue. It has happened on the Kobo Glos as well as on the Glo HD periodically in different covers. And several of the magnets in the covers will turn off the book when the cover is flipped back to read, where I had to put a few layers of foil. It doesn't happen often, just enough to be annoying where you know you have to check when you close the cover. Most of my covers do not have any play in them where they don't close correctly, the magnets are lined up where they should be.
And the magnets in the cover certainly wouldn't explain why when I plug the readers into the USB cable to my PC for charging that the light stays on.
There really doesn't seem to be any rhyme or reason why or when it happens unfortunately. When it decides to stay on when plugged into the USB cable though, I can unplug and replug it in several times and the light will always stay on. I have to turn the light off when it's unplugged when that happens as the only solution. Whereas when the light stays on after the cover is closed, opening it again and reclosing it will always shut the light off.
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