I confirm to have the same issue as @Cedros

I tried restarting the reader, but it keeps reappearing. Here's what happens:
- While writing I pause, then I return with the stylus on the device and write
blindly: nothing appears
- Then I can either: a) wait a few seconds (if lucky), b) tap with fingers on the screen, c) pull down the menu; one of these actions
awakes the device, and at a sudden, my blind write
appears.
This is (with an euphemism)
impractical.
The firmware is version 4.38.21908 dated 22/08/2023; I can't find a newer one