I really don't know what to say about this because you've tried litterally everything. Maybe use a different computer if you have one? I don't think changing the settings will work but you can give it a shot. And always make sure you internet connection is online and has a great connection, but you probably already do that.
I hope your problem gets fixed as soon as possible. But you should really use a different computer if have one. Maybe your compute rjust can't handle Feral Heart anymore?
I highly doubt that...