WP logs me out every 2 minutes

[Henning]

Dear all,

this is a problem that is really driving me nuts! It started a week or so ago and has become progressively worse - even logs me out when I am in the "Add Media" lightbox window!. WP just logs me out every few minutes and work I have done in the backend is lost. I have to post a lot so this really makes my live hell!

I have no idea why WP is doing this (using Genesis and Magazine child theme - www.social-europe.eu). And the whole backend respinds a lot slower than it used to. I haven't added new plugins (and have tried to disable some), I tried different browsers on different computers (and cleared history, cookies, ...), I have tried different user accounts and I checked that both URLs in the general settings match. Nothing solved the problem.

Do you have any idea what can be done to fix this? Thanks very much!

Best

Henning

Ah, another thing. I use Cloudflare on the site but have also tried switching it off. Same problem...