In his case, it was definitely his MicroSD card, but most shops that are still up for the public for free are outdated. The good shops require you to donate/pay. Even after downloading an outdated game from a free public shop, it should still run fine, though it will tell you the game requires additional downloads. From my experience, you'll just end up missing DLCs and updates. I use Teknik, but many of the games aren't up-to-date. Now I use my PC to install NSPs.
