DS ONE cant save any more please help.

My Super card DS ONE wont save my game data anymore. It still works fine when I use it to play movies and music. Ive tried runing that self check thing on my ds (the one where you hold the L+R then turn it on thing) but it said its working fine. I know its not the DS because my "real games" work fine and its not the games itself because its happening to all of them. It has to be the card itself. Any ideas or should i just get a brand spanking new R4... but dont just post for me to get an R4 because thats not realy helping. Its fine if you guys cant help but i gdont want to buy another $70+ card if this is gona happen again. (>-.-)> (this made kirby sad)

Try reinstalling your firmware, and also deleting whatever save files which don't save (if there is any).

I just installed the new firmware the day before this happened, I think thats whats causing this. I wonder if I should just re-install the old one? (>0.0)>

Yeah, try that, there may be a chance there's a fatal error with the new firmware files. Contact them about it if that's the case.

Screw It! I just bought an R4! (>0.0)>