wii u error code 160-2203

hello all

I got my wii u at the start of the month with mario cart 8. It work perfectly until today when out of nowhere when i tuned it on i was treated to a message there is a problem with the system memory. Please contact your local customer support centre, quoting the error code.

error code: 160-2203

Don't no what happened but half thinking it may have overheated with the weather the way it is and a decent amount of time played. Looked on the internet couldn't find much information except other people with the error with out any real solutions.I taught I might try return it to gamestop for new console but worry that the downloaded games from the eshop won't transfer to the new console. I sent an email the nintendo customer support but no reply yet. any information or advice would be greatly appreciated.

Thank
also first post