few games are freezing

title^^^^the games are brothers in arms DS, Mega Man ZX, Rythm Heaven so far.
all this started right after I put M&L:Partners In Time on my flashcart, but BIA does work sometimes.

You are missing a few key ingredients in your info like what type of flashcart you are using. https://www.romulation.org/forum/index.php?topic=1736.0Take a look at the Common Issues thread
https://www.romulation.org/forum/index.php?topic=1462.0