Since yesterday I constantly get logged out in Chrome (Windows). If I close the browser and open it up again I need to log in again. This doesn't happen on other websites and forums and doesn't happen on the ipad (Safari).
Aside from making sure to check "keep me logged in" when you log in, try clearing your cookies and local cache. There's very little on the server that can help or control this, so unless everyone was having this problem, you'll have to try local troubleshooting.
Clearing local cache and cookies is the best first step.