Freezes when saving every single time

Currently i run my nds roms on a m3ds real with the sakura system. With dragonball origins and a few other games it plays fine from the start (intro to the title screen) but then when i try to save game.. the ds just freezes - i know that i has frozen because it says "please wait, saving.." and just keeps saying that forever.I don't know what the problem is.. is it something to do with copyright from the game owners or is there something that i need to change... this has been happening to me for a lot of games lately.Any help would be greatly appreciated thanks

https://www.romulation.org/forum/index.php?topic=1462.0 Not the ROMs, mostly the read and write speed of your MicroSD :)