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It's probably a problem you're having with your browser. Maybe cookies are not working properly, so the forum asks you to sign in again for this reason.
And the same goes for the "thread doesn't exist" thing: your browser could be having troubles, so the page is not refreshed properly and it redirects you to a thread that no longer exists (for example because someone moved the thread or because someone deleted it).
It has nothing to do with the Forums security. It 100% depends on your browser.
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