I have been having this very same issue - I have nailed it down to the latest firefox release. I have told my users to add the site to the whitelist or "exceptions" and to clear their cookies/reboot and the problem should be fixed - of course be sure that remember me is clicked.
This has become an issue within the last few weeks - I have had one user report that it had happened on all sorts of browsers, but I have yet to see an issue - the only constant... I haven't updated firefox and they have.
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