It's been my experience that most internet sites will shut you down so to speak after a period of inactivity (aside from static typing) if you don't choose keep me signed in or some equivalent option that may be offered at sign-in. I think it's a feature for security reasons in most cases, kind of like a "Kill Switch" so that if you walk away from your computer, or you drop dead sitting there, someone doesn't come along and pretend to be you on that site (like on your bank site for instance).
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