Never experienced anything like that on my KA1 although I'm not running the very latest firmware.
I would try a factory reset and see if that resolves the situation. If not, then I'd seriously consider returning it. Even when it's been very hot out, my KA1 never acted like that.
Out of curiosity, what firmware is your device running? What kind of books do you have loaded on to it? How have you loaded them? Has your Kobo functioned likt this from the get go?
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