I'm looking for alternative solutions that can be done immediately, if possible without the use of money, but if nothing else works I'll gladly buy a new card.
As of yesterday, whenever wireless communication is enabled, after 10 seconds my 3DS will stop whatever it was doing and pull up the black screen stating:
"An error has occurred. Hold down the POWER Button to turn off the power, then turn it on and try again. For help, visit...