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Reboot. Recharge. And see if the issue is still there.
If the battery drain continues, contact Kobo to let them know about the issue, then either wait until they issue a fix in a new update or roll back to the last good FW.
Personally, I would roll back to the last good FW. I never bothered with the most recent updates, especially after hearing about the black screen kerfuffle. Won't ever bother with any more updates unless they promise some new feature which I couldn't live without. Very unlikely.
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