I've had an occasional frontlight flicker on my Glo recently, I found that turning it up to full brightness for a few seconds and then back down to where it was stopped it.
I normally read with the frontlight at about 10% in full darkness, or 20%-30% in bad light, or with it turned completely off in good light.
It has only happened a few times over the last few months, so it is not a problem for me at all yet, but I think it could be a sign the device is aging.
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