DS randomly shuts off.Using N-card,ONLY new games help

Im copying this topic that I made from Gba temp.I have a very stuupid problem with my N-card an need ANYONE with any idea of wth is wrong;


I figure this is a defect/bad dump of a game.But recently I downloaded two different ones.Mario in time or w/e,an Yoshi Island DS.After putting on Yoshi Island DS .It will just randomly shut off during gameplay during Only that said game.However just to make sure it wasn't a cart going bad,I checked a diff rom an left it on for quite some time..nothing happened.SO I figured it was just that game.But like I said,I went an got two.The other being Mario in time or w/e.Well I put that in an a hour in it turns off DS..


So in conclusion,is this a normal problem with the N-card/clones.Or is this some sort o defect from the game.I read about the save glitch,where you get several save files.An it messes it up,but thats not the problem.Any help appreciated.