I also had this. I have an original kobo was one of the early upgraders to 1.8.1. This happened to several people who upgraded within the first couple of days.
About a month ago I posted the same question here. The answer was to do the upgrade again - it is now 1.8.3 (I think) and the issue has been resolved.
What version of firmware are you on as this could be your problem.
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