Been using the app successfully for years, so it's not "Operator Error." Bought enough to earn a free pizza, went to order it a day or two later, and my account was completely logged out. Tried to re-log in and it said my email address was invalid, despite Domino's literally sending emails to it days earlier. Tried uninstalling/re-installing, rebooting my phone, same thing. Guess it's off to the competition for me.