I seem to be having a problem with my R4 DS which I have no idea how to diagnose. Sometimes after turning the DS on with he R4 inside, it does not recognise its there. It loads straight to the normal DS menu. Typically it will only happen once or twice but sometimes 4-5 times, after which it will load like normal, not even touching the card. This wouldn't bother me as much but its the exact same reason my M3 MiniSD (GBA Slot) stopped working - it started off not recognising it once or twice then 5-10 times before it would work and then never. Always booted to a white screen/black screen/DS Menu. I'm worried about the quality of this card too.