A possible explanation?
The battery continued to drain off every time I left my flat, and I started to wonder whether it could be due to the magnetic lock on my handbag, on the outside of the pocket where I stored readers. It shouldn't have since I've used that handbag since I bought it in September and the problem started in January, AND the automatic sleep off is always disabled.
So I bought another handbag with just a zip, no magnetic lock, and have been using it since February 5th, and the One or the Glo HD's battery haven't drained off even once.
This is no scientific demonstration, but if it is the cause it is annoying since it's practically impossible to avoid magnets, what with phones, credit cards, transport passes and all.
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