Hi Nathi,
I don’t know how to reset them, but there is an Addon called Copy Render Settings in blender, so you could copy the settings from a new file to your file. But you could also just Append your Scene into a new File.
The bad news is, that it has probably to do with your hardware and not with the render Settings…at least that is what I expect, can’t be sure. I have had EEVEE crash on my old computer, while Cycles was doing fine.
