R4 Help Please

Ok i have about 10 games on My R4 and i had'nt put any on for a while so i downloaded two games mario kart and pokémon pearl and they worked but the next day i turned on my R4 and the games were gone this happend twice what am i doing wrongthanks in advance to all the helpfull users @ romualtion.net!

All the games, or just those two? Try backing up (copy all your files somewhere) and reformat your MicroSD.