Grey/black horizontal lines makes phone look like lower resolution

My phone just had these grey/black thin horizontal lines appear on the screen out of nowhere. They cover the entirety of the screen and make it appear as though the resolution is lower. Early on I was able to turn screen off, then back on to get rid of them, but they would eventually appear again. Now, they are there even after I turn the device off and back on.

I haven’t done a hard reset as I need to back up my phone, but my old laptop has less memory than my phone. Has anyone else encountered this issue?

Thanks in advance, Bronson