pokemon black always freezes??????????

When im playing pokemon black that i downloaded from romsite.net on my r4 sdhc, v 1.38, it randomly freezes after about 5 minutes of play. and it does it over and over and over again! how can i stop this???????? any direct links to patches?

Get the pokemon black from here.

its not on this website. i searched "pokemon black" and "pokemon" under ds roms and cant find it

http://forum.romulation.net/index.php?topic=53401.0