There have been several cases of clock stalling when the device is turned off or suspended (not exactly the same case as discussed here) . It happened to me with the InkPad 3. I removed the back cover and disconnected the battery and everything went back to normal when I reconnected it. (Obviously on devices with water protection it is not recommended to do this) . I don't think KOReader has anything to do with it. I use it on all my PocketBook devices and it has only happened once. Other people don't use KOReader and it has also happened to them.
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