I have had this issue for almost a year now and have posted before with no resolution... My wordpress dashboard keeps logging me out and giving me this message: http://vohafrica.com/wp-content/uploads/2014/06/Screen-Shot-2014-06-27-at-2.45.18-PM.png
I have read the forum and others have this problem, too and no fix. It is incredibly frustrating. Sometimes it won't do it for an entire 2 hour session. Today for example, it is logging me out every 30 seconds.
I even tried to plugin that manages login timeouts and that didn't resolve anything.
I have another site using wordpress that doesn't have this issue at all.
Any help would be much appreciated because this is enough to drive someone bonkers! :)