Possibly the same issue as
https://www.mobileread.com/forums/sh...82#post3856382
Top left 1x1 cm freeze (fist picture) and never refreshed since I plugged in the charger for the first time.
The square-shape damage slowly extends with time: 2 days after its surface is double (~2x2 cm -- second picture).
The device is new (3 weeks), I always used it with with care, placing it inside its cover pocket when not in reading. Never bent or hit. Upgraded to last firmware.
Thanks in advance for reading and for any help!!