Looks like a bug with cookies. I keep losing access to game guide, Armory, and New season news posts and other pages. I’ve had to delete the site cookie 5-6 times today and reenter a DOB. Flipping between viewing profiles/game guide page/read new season news it corrupts the cookie and produces “Internal server error 500” until the cookie is deleted.
According to search, looks like it happens to other people randomly as well.