I have this problem as well. Not after sleep though. Just while reading, sometimes the screen does not respond anymore. Sometimes just pressing the sleep button twice will work, sometimes it won't (and I need to use a paperclip in the reset button).
I've tried this so far:
- Turn of water drop detection
- Turn of auto-wake
- Use the e-reader outside my case with wake-up function
- basic reset
- factory reset
- side loaded epub
- kepub
It does not change for me. I keep getting this problem. I e-mailed with Kobo about this problem (dutch support) and they told me to reset. When that didn't work they suggested I return it to the store where I got it. The store is going to replace my e-reader now. I've sent mine away today and hope to get the new one saturday or monday.
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