Recently, all kinds of SKY3ds game problems occured, but according to most players said, if they changed one MicroSD card to try again, the problems disappeared then the card worked well, game roms could be cycled smoothly. Combined what people say, here are some advice for you to choose the best SD card to work for SKy3DS:
One player said: “I bought a blue button Sky3DS a few days ago with a new ADATA 128Gb microSD card. Put a few games on it & tried playing on the 2DS & I was able to play only the first game I loaded up. The Sky3DS would just flash the blue LED constantly the entire time no matter what I had tried. So I decided to grab my Sandisk 8Gb microSD card & load up some games. It worked perfectly as it should.
Not sure if this makes a difference or not but also I am using the latest downloads from the Sky3DS website for DiskWriter & the template.