WordPress fix WordPress keeps logging me out on backend

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WordPress keeps logging me out on backend, by vpbay

WordPress keeps logging me out after 10 or 20 seconds later when I am on backend. And also some strange things happenning: When I login again the site goes back to old hours(Like some new posts dont appear, some plugins which I have deactivated before seen reactivated and so on). Sometimes it says your session ended or Error: You have entered an incorrect reCAPTCHA value.
How can I fix?

Note: Link is NSFW

WordPress keeps logging me out on backend