logging in and out randomly?

When does it happen? On its own when you're not actively using the sites… or just between pageloads, using that site, going from one page to another, you're signed out out of nowhere?

Or "without doing anything" means you come back to work next day, maybe even starting the browser after it's been shut down, and some sites require a login?

(BTW have you confirmed the actual deletion of cookies reported, i.e. inspecting the list of cookies and storage for the site while it works, and observing the same entries disappear once you're signed out?)

I get to work,(home health care aide and work overnight). Client sleeps, when I leave the computer for let's say 15 minutes to do some work tasks, and come back I have to log in again. It will happen 3-4 times a night for a 9 hour shift and it logs me out of yahoo, Instagram , almost everything SAVED site on my computer. I have not deleted any cookies on my own, and it shows they are still there.