Users experiencing Error Code 160-0103 report a number of related issues, ranging from data deletion to unplayable games. In some cases, a related error message (160-1710) persists even in the Wii U's Data Management menu, requiring the console to be shipped to Nintendo for repair.
"There is a problem with the system memory," the error message . "For help, make a note of the error code and visit support.nintendo.com."
A specific cause has not been determined, but many users report experiencing the issue after turning the system off and back on again after a Super Smash Bros. for Wii U session. Issues related to Error Code 160-0103 were infrequently reported prior to the release of Super Smash Bros. for Wii U, and a reliable solution is not yet known.
Joystiq has reached out to Nintendo regarding the error message, but has not received a response.
[Update: A Reddit post clarifies that the problem is not exclusively caused bySuper Smash Bros. for Wii U, citing previous user experiences with Hyrule Warriors, Mario Kart 8, and other Wii U games. Faulty flash memory chips are suspected to be at fault, though a consistent, proven cause remains unknown.]