Some are experiencing login problems and having to sign in every day. I am not having these issues. So I thought I would add a couple places to check.
What internet browser are you using? IE, Firefox, Chrome, etc. (I am using Chrome and not seeing an issue)
Do you have any security settings enabled to automatically delete your cookies? (not the edible kind of cookies!) If your web security settings are set to high, then it might not keep you logged in.
Those are my first two guesses. They aren't good, but maybe people could post some more details of their system so we could have more clues.