I agree.
Try cleaning with a soft brush or similar along the edges to make sure there isn't anything blocking the IR beams.
Another issue people have suggested (I forget whether it was ever verified) is that certain books (possibly related to being badly formatted) can cause excessive battery drain, it was also suggested that this was worse when the reader was put to sleep with that book open. So try exiting your book and then putting it to sleep.
Maybe there are other people who can come up with some other suggestions. How long have you had your glo? How long have you been experiencing this issue? Since 2.8.1 firmware or before?
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