We have absolutely NO control over that system. The only thing we have is an ON/OFF switch. She could have 'reset' the system by turning it OFF and ON, but my experience doing this is that it doesn't help about 75% of the time. As far as swiping cards again, my general experience has been that those who have swiped already do not have to do so again. However, I have seen the system 'reset' and pax have had to re-swipe their cards. I've had transcon flights where the system worked perfectly one way, and then only stored content on the next. As frustrating as it is for the pax, I consider it to be doubly so for the crew because we really can't do anything other that turn the system OFF/ON. Sorry to hear about the trouble.