What kind of crashes? Could you have bad RAM and the crashes start once the bad chip get put into use?

I would show you task manager showing 100% of user addressable space being used. It seems to reserve at least half of its memory for Windows itself or background processes. What kind of crashes? Applications just shutting down without warning, or Chrome slowing down and struggling to display anything, or itself closing. If there is a setting I could change, I've likely tried it, but I'm open to suggestions.