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If "every so often" means "every couple of weeks", then my Kobo readers (one Touch model B, one Touch model C) show the same behavior as your Glo. I came to think of it as the normal case. With pre-2.4 FWs it was rather worser.
In most cases it is sufficient to force a power off (slide the power slider to the right and hold it for 15 seconds) and power in on again.
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