TI-83 Plus keeps going blank when it get's to the bottom of the screen

I have a TI-83 Plus Silver Edition that I just recently purchased because my other one was having this issue, and now this new one is having the same issue. What happens is I'll be typing stuff in and once the numbers get to the bottom of the screen, it just shuts off and I have to press 2nd on to fully shut it off before I can get the screen to show up again. I just gave it new batteries, including a new cell battery and I tried resetting it. Sometimes with this new calculator the screen will just randomly go blank before I've even reached the bottom of the screen.

Basically, either the screen shuts off or it turns really dark and a bunch of black lines appear when I reach the bottom of the screen. Does anyone know how to fix this? I bought it used, maybe somethings worn out idk.