I keep the Kobo cover closed when I'm not using it and never have food anywhere near it. Just to make sure, I used some compressed air to make sure there was no dust anywhere.
I started paying more attention to the bottom area tapping and found that it's intermittent. One thing I noticed is that when I first start reading, it works fine. After a few page turns it seems to stop working.
As others have noted, the bottom area works fine with menu selections, it just seems to be an issue with regular reading.
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