ghost UI images on the SLEEP screen

[dial-888]

Maybe it's something wrong with my hardware, but on the 1.22.6 and 1.23.2 firmware I get ghost image of the UI on the SLEEP screen. It's not always appears immediately, may appears after 1 to 10 hours in sleep mode.

[dial-888]

I think ghost images on the sleep screen appears if indexing attempt unsuccessful with "Full Book Process" - ON.
Or maybe long time indexing affects it too. I can see ghost image of "Indexing" process (like burn in on the CRT) in the book text .