Hi,

I logged in by the main page. It just happened again. I logged in I clicked notifications and it asked me the username ans password again.

Don't worry too much. I suppose if after logging in I keep that page open and open another tab (and do what I need from there) it will not probably log me out.

Looks like you are not using HTTPS. May be (guessing) there is some relation having in mind browsers are becoming very suspicious about that.

Regards,
S. Cabo