Happens about once a month (?) because Login Cookie for Forum is not permanent, it only keeps you logged in for a certain length of time (1 or 2 months, not sure exactly).
Or else could be you were in PRIVATE Mode (or deleted Cookies) for your Browser, then you probably would have to login each time.
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Or else could be you were in PRIVATE Mode (or deleted Cookies) for your Browser, then you probably would have to login each time.