Have you uninstalled / reinstalled and tried the 'light' version instead of full?
Is your internet fast & strong?
Have you tried restarting your router?
I was thinking of trying the light version, but I never understood what it was. Does it just make things run smoother? c':
My internet is pretty fast and strong, and I have tried restarting my router, but no change.
The light version is basically what it is. Less detailed and not overly textured. Since it might be the game card, it could help c: if what Kynvuu suggested didn't work as well.