We use cookies to keep you logged in and my guess is that if you're finding a change in how you are logged out, there has been a change in either your browser settings or security scheme to purge cookies.
When you first login, check the "remember me' box on the login screen. Next, make sure your system is allowing cookie exchange with the site.
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“You have brains in your head. You have feet in your shoes. You can steer yourself any direction you choose.” -- Dr. Seuss
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