Mac resolution/display randomly changed So i have a Macbook Pro 2015 15" default of resolution 2880 x 1800 running Catalina, I recently turned it on and either my resolution has been changed or my scaling zoom ( icons, text size etc ) has been altered. I'm 100% that I haven't made these changes myself, nor has anyone else in terms of physically accessing my mac. 

Wondering whether this is a common issue or some form of malware/virus?

I've ran Malwarebytes and various other tools to try detect an infection, nothing was detected.
I recommend you reset your NVRAM. This chip stores information on screen resolution and can often become corrupted. You can reset it by starting your Mac while holding down cmd + opt + P + R . You should hear the Mac chime, restart and chime a second time. Then you can release the keys you are holding. More info here.