Thanks...really appreciate your time.
Looks like nickel suspend works as expected, testing CR3 now and will take the discussion to the KOreader thread.
Long story short...what is your recommendation for sleep mode? Power off whenever the reader is not used for a longer period? Looks like that was the conclusion of your test...in the second link and pointing to the log.
/EDIT I'll post a reference to the KOreader discussions (and potential solution) in case someone else stumbles across this post.
https://www.mobileread.com/forums/sho...postcount=2449