horizontal line flickering?

[Bromad]

Hello all
I have a quick question about a new HP Prime I just got in order to replace my old one.
Mine was stolen out of my car a few weeks back at school, and have dearly missed it. I just got a new one today from Best Buy and the gray lines that separate calculations on the home and cas screen are flickering to a distracting extent. I've already tried updating the firmware. Does anyone happen to know if this is a known QC issue and I should just swap it out? Or are there any software fixes for it?
Any help is appreciated from this broke undergrad