Blood Bowl flickering?

I've been playing Blood Bowl (great game, does well until the PC version is a bit cheaper), but I've noticed a bit of flickering when playing, during load times or when the AI is making its moves. Does anyone know what might cause this, like maybe the read/write speed of my sd card is a little slow?My specs are:
US DS Lite (I know the DS is region free, but whatever)
CycloDS Evolution, latest firmware
A-Data 4gb microSD (I think class 6)
And the rom Romulation has up (3944 - Blood Bowl - Europe)The game isn't absolutely perfect on its own though, so it may just be a screw up on their end. Its not that big a deal, just a little distracting sometimes.

Try backing up and reformat your MicroSD. I'm not sure of A-Data is good for this, such as Kingston or Sandisk.