If you make changes in to the permalink structure, you effectively change the address fot the post which is why you get the 404.
To update to thenew address go back and edit each post and save or if you have lots of posts you'll need to do it in .htaccess so any links coming in on the old address will redirect.
To get the address you want use :
/%postname%/
or for even better SEO I'd use
/%category%/%postname%/
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