This is a known issue with Adobe DRM ePubs in 1.7.4. We are testing a 1.7.5 version that fixes it. Given how close we are to Xmas, we are only releasing critical fixes as the moment, so we likely will hold off on this until early January.
I know it is annoying, but I believe you can work around it by either letting your Kobo naturally go to sleep after 15 minutes, or pressing home before putting the device to sleep.
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