hey fellas, don’t know where to post this, my first time here
my gf is getting this weird bug whenever she uses render preview or material preview
shes not using any mirrors or anything, it happens with any shader, idk why
Welcome to BA 
Three suggestions:
This looks like a GPU issue to me. What GPU do you have? Have you updated the drivers?
This could also be a clipping distance issue- I don’t think it is, but it might be.
You have a lot of other programs open. I’m assuming this is a laptop- if so., you don’t have enough RAM to run Blender and have anything else open. Close all other programs- including invisible background processes like OneDrive, Discord, etc, and see if that helps
hey sorry for the delayed response
the gpu is a AMD Radeon R4 graphics
ive tried to updating the drivers but it didn’t fix the issue
its weird, one day blender didn’t have this bug until after a while, and now suddenly it has it, i even tried using older versions of blender and it still had this bug
i tried closing down other programs to help with ram and it didn’t work