While using journal...
>Pressed journal "Open library: No response.
All attempts to get a response from LCD from journal failed. (i.e. save, info, recent, etc.)
Writing, change pen size, erase, etc. functioned.

LCD screen on 'Desktop'.(Term-?).
> All shortcuts and buttons - non-responsive.

>Pulled/Installed battery: Back to normal ops.

OP INFO: Fully charged. Had made several videos, used journal, etc, prior to problem.
1st "problem" on my eDGe.

Will file as "undetermined operator error" unless repeated or reported by others.