I had mysterious waking and sleeps with my Glo before getting a cover for it. It too me an embarrassingly long time to realise that it was because I was putting it down on my iPad which was in a cover. If I put the Glo on the iPad in the right position, the magnet in the cover was was triggering the sleep and wake in the Glo.
Other than something like that, I don't know. I doubt the light sensor is being used as that would be using some power all the time. The button being sensitive is a possibility. If I had one, the position of it would make it likely for it to be touched if it went into my bag. And I suspect I'd hit the button when pulling it out of the bag.
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