Strange behavior on fresh install

Deal all,
I’ve just made a fresh install of latest SuiteCRM on my server. After login in the site is being re-loaded every 2 seconds. If I am fast enough to switch to a module (like Sales) I’m back on the dashboard within 2 seconds again.
I managed to delete all dashlets as I thought one of those might cause it, but the problem still occurs. I also tested different browsers, still facing the issue.

This makes SuiteCRM for me non-useable. Aside from this being pretty annoying. Any ideas would be highly appreciated!

Thanks, Oliver