I've been using this tablet for 11 years and haven't had any problems. Then this problem appeared after I charged the tab in my kitchen, where I got an old electric stove, fridge, and a washing machine, maybe it's somehow related to this glitch. After roughly 2 weeks the problem disappeared and screen became sharp again. But then I turned on the tablet in my kitchen and this problem appeared again, even the worse then the first time. Pictures are from the first time, this time the blurr is somewhat stronger.
Picture 1: Image is blurred when opened by the tablet.
Picture 2: The same image isn't blurred when it is set and displayed as a turning-on wallpaper image.
Picture 3: Right lower corner in shifted.
Picture 4: No artifacts on the screen when the tablet is turned off.
Picture 5: Battery isn't bloated and everything seems ok on the inside.
How to fix it? Thanks to responders.