you caught me in a transitional period. i'm trying, really trying to stop telling people to use the search button and google. really i am...
the ak2i was rushed to market, its poorly constructed. this is evident by the vast amount of people with the same common problems. these include msd inserting problems, msd slot problems, connection problems, and build quality. the build quality relates to inserting and removing the linker from the dsi, the cards get stuck.
now with all that said, have you tried a retail game? if so then its probably the ak2i, and yes i would contact my retailer and ask for a replacement or my money back. if you don't get what you pay for in life, return it. that is your right as a consumer!
-another world